2022-2023学年黑龙江省鸡西市七年级（上）期中数学试卷（含解析）

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2022-2023
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ËÌ<ÍÎᡃÐᩖ¾¿ÀÑÒ☢ÔÕY2.5Ö×.Ø250000000ᵨÙÚᦪM⊤zY2.5X10",ᑣ஻=.215.ᓫ⚗)[5_ßḄ+ᦪ!216.`ÑàáF7âãäUᨵᳮᦪ4,Aᨵa^b=a-b+\,åæ᪷çàáF

221.EF:(1)1.25+(-0.5)+(-2—)XI21A1(2)(-81)4-(+3—)X(--)4-(-1—)4913বᔩ)-(+)+(-&|)-(+q)192(4)-8721+53-1279+43ᐗম5xy-yx3y2-4xy+yy2x3-yxy~3x3y2(6)2(3a2b-ab2)-3(2a2Z>+l)-3&+3.22.ᐜᓄ)*+,-প-3(X2-2X)+2('|"x2-2x—1-)>ᐸ2x=4ফ7x2y-[6xy2-5(xy2+^x2y)—^-xy2]-xy^<ᐸ2x=2,y--1.(3)5/-2(3/+6xy)+(2/-5x2),ᐸ2x:*y=—32(4);4=3஻2+4஻b+5,B=஻2-2஻b.?mABC᎔ᦪF*,A-38Ḅ-.23.HIA=512-J஻*B=-3y2+2x-1,KA+32LMNO⚗QRᦪ⚗*,2(S2஻-1)-5m2n+4Ḅ-.24.᝞U*HIᦪVWᨵ4ஹBஹC[\]*^_⊤aḄᦪᑖcd-24,-10,10.(1)efAB=,BC=(2)K]Aghi1\ᓫklmḄnmᔣpqr*sF*]3Q]Cᑖcghi3\ᓫklmQ5\ᓫklmḄnmᔣtqr.;qrFuC3ᵨMIḄwᦪx⊤aqry8CQ45Ḅl*dᔲ{ᙠ}ᔠ⌕,ḄSḄ-*Ḅ-LFu*Ḅᓄᓄ*K{ᙠ*,SḄ-*KL{ᙠ*ᳮᵫ.ABC----•---------•-------a-------•------►N24-1001025.▅ᳮ᦮wᣚdN⌕Ḅᦪ.᝞2(2஻?+஻)-5(2O+஻)+(2m+n)F*(2m+n)ᡂN\᦮*ᔠs⚗-2(2S+")*+ᑭᵨᑖ¢£¤¥¦-4m-2n.(1)KHI2m+஻=2,§¨ᑭᵨ᦮wᣚ,wᦪx6S+3஻-10Ḅ-(2)N©ª«lC2S+¬©ªḄ«lᙳ¯S1°y*ᐸ☢²³´ᩭ©ªḄ☢²ᜧ9,,2/஻+஻Ḅ-.

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4·ὃ¹ᫀNஹ⌱¼⚪¾h¬⚪3ᑖᐳ39ᑖÀ1.᝞Á|x|=-x,ÂÃX—■Åd¾ÀA.©ᦪB.ÆᦪC.Ç©ᦪD.ÇÆᦪூᑖ᪆௃᪷ÉÊË-ḄឋÍᓽ,.᝞Á|x|=-X,ÂÃXNÅdÆᦪᡈ஺ᓽÇ©ᦪ.ᦑ⌱C.2.ᓫ⚗x-32Ò2z3ḄÓᦪQOᦪᑖcd¾ÀA.-1,8B.-3,8C.-9,6D.-9,3ூᑖ᪆௃᪷Éᓫ⚗xÓᦪQOᦪḄÅÔ,.ᓫ⚗x-32Q2Z3ḄÓᦪQOᦪᑖcd-9,6,ᦑ⌱C.3.ᵨÕÖ×ᐭᢥ⌕,Ë0.05019ᑖcÚÛÜ-*ᐸ2┯ÞḄd¾ÀA.0.1ßàᑮ0.1B.0.05ßàᑮâᑖkC.0.05ßàᑮᓟᑖkD.0.0502ßàᑮ0.0001ூᑖ᪆௃᪷ÉÛÜᦪḄßàmḄÅÔ⌲Nᑨæᓽ.Aஹ0.1ßàᑮ0.1,©àBஹ0.05ßàᑮâᑖk*©àCஹ0.05ßàᑮâᑖk*⌱⚗┯ÞDஹ0.0502ßàᑮ0.0001,©à;ᦑ⌱C.4.¾-6X
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5C.-2022D.202220222022ூᑖ᪆௃᪷ÉîïᦪḄÅÔñò,.-2022Ḅîïᦪd2022,ᦑ⌱D.6.óᑡL©àḄd()A.0õLd©ᦪ*öLdÆᦪB.1dÊË-ᨬ¬ḄᨵᳮᦪC.N\ᨵᳮᦪLd᦮ᦪødᑖᦪD.0ḄÊË-d0ூᑖ᪆௃ᑖc᪷ÉÊË-ஹ0Ḅᱯúឋ*QᨵᳮᦪḄᑖëì⌲\ᑨæᓽ.A.0õLd©Æ*öLdÆᦪ*©à*L}ᔠ⚪ûB.ÊË-ᨬ¬Ḅᦪd0,ᡠgB⌱⚗┯Þ*}ᔠ⚪ûC.᦮ᦪQᑖᦪýþᨵᳮᦪ*ᡠgN\ᨵᳮᦪLd᦮ᦪødᑖᦪ*ᡠgC⌱⚗©à*L}ᔠ⚪ûD.0ḄÊË-d0,ᡠg஺⌱⚗©à*L}ᔠ⚪û.ᦑ⌱B.7.óᑡBC᎔ᦪḄd()A.3QíB.-2Q2C.3Q-íD.-2Qí332ூᑖ᪆௃᪷᎔ᦪḄ1Ḅᦪᓽ.4.3X=1,ᡠ32"᎔ᦪ#⌱⚗4&ᔠ⚪)B.-2X2=-4,ᡠ-2+2,"᎔ᦪ#⌱⚗8,&ᔠ⚪)C.3X(-5)=-1,ᡠ3-5,"᎔ᦪ#⌱⚗C,&ᔠ⚪)D.-2X5=-1,ᡠ-25,"᎔ᦪ#⌱⚗O,&ᔠ⚪)22ᦑ⌱A.8.ᢥ789:᣸ᑡḄᓫ⚗>a,-a2,a3,-a4,a5,-a6,...,?஻ᓫ⚗>"()A.a"B.-a"C.(-1)n+'a"D.(-1)"a11ூᑖ᪆௃CDEF஺ḄHᦪஹJᦪḄ9:ᓽᑏ?"ᓫ⚗>.a,-a2,a3,-tz4,a5,-a6,...,(-1),l+]*an.

6ᦑ⌱c.9.OP7ᓫ⚗>ḄHᦪ-3,Jᦪ4,Qᓫ⚗>"RSA.3xyB.3/TC.-3x2y2D.43ூᑖ᪆௃XYᑭᵨᓫ⚗>ḄHᦪ+JᦪḄ8ᑖ᪆\]ᫀ.Aஹ3_ᓫ⚗>ḄHᦪ"3,Jᦪ"2,,&ᔠ⚪)Bஹ3x2/,ᓫ⚗>ḄHᦪ"3,Jᦪ"4,,&ᔠ⚪)Cஹ-35S2,ᓫ⚗>ḄHᦪ"-3,Jᦪ"4,&ᔠ⚪)Dஹ43ḄHᦪ"4,Jᦪ"3,,&ᔠ⚪.ᦑ⌱C.10.a,b"ᨵᳮᦪbcᙠᦪefḄghiḄjk᝞mᡠnoজ-a,b,-bᢥ᯿rsᑮᜧḄvw᣸ᑡRS-------------1--------1-------------------------1----------------->a0hA.-b<-a0>“|}~.ூ]௃CDᦪePb>0>a,6Ḅgᜧ஺Ḅg.ᙠᓃᦪ-aᔠ|}\஻?=஻+2,ᓽ\]ᫀ.-2஻"ᡝ+52ᡝᔠᡂ7⚗.../%=஻+2,Jm-஻=2.ᦑ⌱A.12.ᜧsᐰḄzᐭ4Ḅsz\ᑮmজmঝḄ▢¢£ᑖ᝞¤ᜧzḄᑣmঝ+mজḄ▢¢£ᑖᕜ¦§"R)

7ঝூᑖ᪆௃¨mszḄX,©y,⊤nm▢¢£ᑖḄᕜ~¦§ᓽ.¨mঞszḄx,©®ᜧzḄ©஻᪷⚪\x+2y=m,x—2y,ᓽy——m,4mজ▢¢£ᑖḄᕜ2("-2)+)=2஻-4)+2ᡂmঝ▢¢£ᑖḄᕜ2஻+4y+2y=2஻+6y,ᑣmঝ+mজḄ▢¢£ᑖᕜ¦§"2n+6y-(2஻-4y+2஻?)=10y-2m=^in-2/n=y.ᦑ⌱B.13.᝞mᵨ³᪷Ḅsᩈµ¶ᡂm¶?1m◤⌕6᪷sᩈµ¶?2m◤⌕14᪷sᩈµ¶?3m◤⌕22᪷sᩈµ……ᢥ᯿Q᪵Ḅz{¶ᡂḄ?n?Im?2m?3mA.252B.253C.336D.337ூᑖ᪆௃᪷mᱯ¾?1m◤⌕6᪷sᩈµ?2m◤⌕6X2+2=14᪷sᩈµ?3m◤⌕6X3+2X2=22᪷sᩈµᢥ#9:\?஻m◤⌕Ḅsᩈµ᪷ᦪᓽ.ᵫ⚪P?1m◤⌕6᪷sᩈµ?2m◤⌕6X2+2=14᪷sᩈµ?3m◤⌕6X3+2X2=22᪷sᩈµᢥ#9:?஻m◤⌕6஻+2(??-1)=(8"-2)᪷sᩈµÀ8”-2=2022Á

8\"=253,ᦑ⌱B.ÂஹÃÄ⚪(ÅÄ3ᑖᐳ21ᑖ)14.⊱◖É▾ËÌÍ“ᩖÐÑÒ¦᱄”ÔÕÖ×⚞ḄÙÚÛÜÝÞßàᡃâᩖÐÑÒãä☢æ2.5çè.é250000000ᵨêëìᦪ{⊤n2.5X10",ᑣ஻=8.ூᑖ᪆௃êëìᦪ{Ḅ⊤n>"X10"Ḅ>ᐸn᦮ᦪ.ï8nḄÁ⌕ðoñᦪòᡂ஻ÁsᦪióôõÛöj஻Ḅg+sᦪióôḄjᦪ.Àñᦪg÷10Á஻"ᦪ)ÀñᦪḄgø1Á஻"ᦪ.V250000000=2.5X108.ᦑ]ᫀ8.215.ᓫ⚗>7ᐔabḄHᦪ"-Â.ூᑖ᪆௃᪷ᓫ⚗>ḄHᦪḄ8]ᓽ.-ᐔú2ḄHᦪ-3.22JTᦑ]ᫀ-.16.987ãýþÿ
ᨵᳮᦪab,ᨵa^b=a-b+\,᪷(2*3)Ḅ-1.ூᑖ᪆௃᪷Ḅ"#ᓽ%&᝞(ᨵ)*⌕ᐜ-)*ᑁḄ./0(2ਮ3)*2=(2-3+1)=0^2=0-2+1=-1.ᦑ7ᫀ90-1.17.ᙠᦪ4.3,|0|,-(->-|-3|,-(+5)@4.3,-(-ᒹ)Bᦪ.ூᑖ᪆௃✌ᐜDᔜᦪᓄGH᪷BᦪḄ"#%IJ(./0ᙠᦪ4.3,|0|,-(-K)=K-|-3|=-3,-(+5)=-5@4.3,577

9Bᦪ.ᦑ7ᫀ904.3,-L--yN.18.PQ⚗S5/-UV-᮱+7X-1LY9ZᦪN[\X⚗ᑣm=7.ூᑖ᪆௃᪷ᔠcde⚗fᑣghSᔠcde⚗᪷⚪ᑡklm/lmIᑮ7ᫀ.op05/-mxy-V+7r-1=5x2+L7-஻?Nxy-y2-1,*.*Q⚗S5x2-mxy-y2+lxy-1L9ZᦪN[\xy⚗.,.7-777=0,/I,m=7,ᦑ7ᫀ907.19.ᢥx"yz᣸ᑡḄᦪ|U9}4-~……ᢥyz᣸ᑡᑣ30ᦪ25101788901-3n-2ூᑖ᪆௃ᵫᡠḄᦪyz9஻ᦪF—஻=30ᓽ%/.n+1..14710/:•2510173n-2..஻ᦪn2+l3n-23X30-2஻=30,n2+l-302+1-901ᦑ7ᫀ9090120.PLX-14LX+2N5=஻0+஻]%+஻42++஺99,0+஺3+஻5+47+஻9=-8ூᑖ᪆௃X=l,X=-1ᑖᐭSLX-1N4LX+2N5=஻o+0x+42x2+.+a9x9@DḄJ(Hᓽ%I7ᫀ./0X=1IL1-1N4L1+2N5=஺0+0+஻2+஺3+஻4+஺5+஺6+஻7+஺8+஻9ᓽ:஻0+஺1+஻2+஺3+஺4+஻5+஺6+஻7+஺8+஺9=0জX=-1IL-1-1N4L-1+2N5=஻o-41+Q2-஺3+஺4-஺5+஻6-஻7+஺8-஺9ᓽ0஺0&஺1+஺2-+஺4-஺5+஺6-஺7+஺8-49=24ঝজ-ঝI02L஺1+஺3+஺5+஺7+a9N=-24~.஻1+஻3+஻5+஻7+஺9=-8,ᦑ7ᫀ90-8.¢ஹ/7⚪L40ᑖN

1021.0(1)1.25+(-0.5)+(-2—)XI&21A1(2)(-81)4-(+3—)X(--)4-(-1—)&4913বᔩ)-(+¨)+(-&|)-(+q)&192(4)-8721+53-1279+43-^-&ম5xy-yx3y2-4xy+yy2x3-yxy~3x3y20(6)2(3a2b-ab2)-3(2a2Z>+l)-3°+3.ூᑖ᪆௃(1)D◀f²ᓄ9³fHx´³fᓽ%;(2)D◀f²ᓄ9³fHx´³fᓽ%&(3)ᑭᵨfḄ¸ᣚzJᔠzᓽ%&(4)ᑭᵨfḄ¸ᣚzJᔠzᓽ%&(5)ᔠcde⚗ᓽ%&(6)ᐜº)*Hᔠcde⚗ᓽ%./0(1)hS=~#(-2)X(——)X145=1&(2)hS=-81X±X¼/½139142=-10y;(3)hS=-8-11—5=-1¾51q9(4)hS=(-8721-1279)+(53—+43—)2121=-10000+97=-9903&“ஹ~332,^1231329মbxy-yxy-4xy+yyx-yxy-3xy=(5xy-Jxy-4xy)+(--|-x3y2+-^-x3y2-3x3y2)=/-4Á3y2&

11(6)2(3஻2b-M2)-3(2a2b+l)-3஺ᢥ+3=6a2b-2ab2-602b-3-3ab2+3=-Sab2.22.ᐜᓄGH0প-3(x2-2x)+2(■^~x2-2x-ᐸ@x=4&(2)7x2y-[6xy2-5(xy2-^x2y)—1"xy2]-xy^»ᐸ@ᑍ=2,y=-1.(3)5x2-2(3)2+6xy)+(2y2-5x2),ᐸ@y=—32(4)ËA=3Ì+4“஻+5,B=a2-lab.a,bÍ9᎔ᦪ,A-3BḄ.ூᑖ᪆௃(1)ÐѺ)*Òᔠcde⚗HgÓÔᦪᐭIk7ᫀ&(2)ÐѺ)*Òᔠcde⚗HgÓÔᦪᐭIk7ᫀ&(3)ÐѺ)*Òᔠcde⚗HgÕÔᦪᐭIk7ᫀ&(4)ÐѺ)*Òᔠcde⚗Jᔠ᎔ᦪḄ"#ᐭIk7ᫀ./0(1)hS=-3x2+6x+3x2-4x-1—lx-1,x=4hS=2X4-1=7&(2)hS=7/y-6xy2+5(xy2+—+-^-xy2-xyz=lx^y-6x)a+5x)2+-^x2y+"|ity-xy2_43242"TXyÙxy'x—2,y-—1hS=£1X22X(-1)--X2X(-1)243137F&(3)5N-2(39+69)+(2y2-5x2)

12=5x2-6)2-12x>,+2y2-5x2=-4y2-ফÝ&x=-^»y=#,x3y2hS=-4X(-A)2,12X^X(-A)232=-1+2=1;(4)4=3/+4Ò+5,B=a2-2abf*.A-33=3஺2+4Þ+5-3(a2-2ab)=3Q2+4Qß+5-3஺2+6kà=10ab+5,■a,xÍ9᎔ᦪ,♦♦cib=1,hS=10X1+5=15.23.ÓÔ4=532-á+஻B=-3j2+2x-1,PA+8@[\xU⚗Zᦪ⚗2(஻-1)-5m2n+4Ḅ.ூᑖ᪆௃ᐜᑭᵨº)*ᔠcde⚗fᑣgA+3ᓄGâÒk”ḄHg2(m2஻-1)-5ä஻+4ᓄGåᐭᓽ%Ik7ᫀ./0VA=5x2-nvc+n,B=-3y2+2x-1,*.A+B=(5x2-mx+n)+(-3y2+2x-1)=5x2-tnx+n-3y2+2x-1=5/-3y2+(2-஻z)x+(n-1),A+8@[\xU⚗Zᦪ⚗/.2-æ=0,n-1=0,*.m=2,n=1,2(tr^n-1)-52஻+4=2m2n-2-5m2n+4

13=-3ffl2n+2,tn—2,n—I-3nj2n+2=-3X22X1+2=-12+2=-10.24.᝞êÓÔᦪëìᨵAஹBஹC¢îïð⊤òḄᦪᑖ-24,-10,10.(1)óô0AB=14,BC=20&(2)PîAõö÷1ᓫùúûḄüûᔣþÿ
BCᑖ3ᓫ5ᓫḄᔣ.f,ᵨfḄᦪ"⊤$%8cABḄ*ᔲ,ᙠ.ᔠ⌕1Ḅ஻Ḅ34BC-஻6BḄ378fḄ9ᓄ;9ᓄ<,ᙠ1=஻Ḅ3<7,ᙠ>?ᳮᵫ.ABC---------------------------■-------------■-------------■------------►—24—1001()ூᑖ᪆௃(1)ᵫAஹBஹC⊤$Ḅᦪᑖ*-24,-10,10MNOᫀQ(2)1=A%⊤$Ḅᦪ*-24-f,B%⊤$Ḅᦪ*-10+3f,C%⊤$Ḅᦪ*10+5Z,ᓽMNᑮ%BCABḄ;BC-mAB^(2-4/w)Z+20-14/n,Y2-4Z=0,MNOᫀ.Y\(1)\AஹBஹC⊤$Ḅᦪᑖ*-24,-10,10,*.AB=-10-(-24)=14,BC=10-(-10)=20,ᦑOᫀ\14,20Q(2)A%⊤$Ḅᦪ*-24B%⊤$Ḅᦪ*-10+31,C%⊤$Ḅᦪ*10+56...%BC=(10+5?)-(-10+3?)=2f+20,AB=(-10+3?)-(-24-/)=4`14,,ᙠ.ᔠ⌕1Ḅ᪷Ḅ34Ḅ378Ḅ9ᓄ;9ᓄᳮᵫ᝞c\BC-mAB=2t+20-m(4r+14)=(2-4m)f+20-14m,e2-4f=0,ᓽf=gBC-h4BḄ378rḄ9ᓄ;9ᓄ

14iBC-mAB=20-14X—=13.225.▅mᳮY\᦮oᣚ*qrs⌕Ḅᦪtuvwx.y᝞\z{2(2஻?+஻)-5(2/n+n)+(2/77+H)M|(2m+n)}ᡂq᦮oᔠ
⚗N-2(2%+஻)ᑭᵨᑖN-4”?-2/7.(1)<2m+஻=2,ᑭᵨ᦮oᣚuv1ᦪ"6ᑗ+3஻-10Ḅ3Q(2)qw2,"+|iwḄᙳh1%ᐸ☢ᩭwḄ☢ᜧ9,12m+nḄ3.ூᑖ᪆௃(1)᪷¢⚪¤¥=Ḅ{xᓽM1=Oᫀ.(2)᪷¢⚪¤ᑡ={"ᯠ%ᑭᵨ⚪¤¥=Ḅ{xᓽM1=Oᫀ.Y\(1)e2¨+஻=2,6m+3n-10=2(3m+n)-10=4-10=-6.(2)h1%Ḅ☢\(2m+஻+1)2,ᵫ⚪¤M\(2஻z+஻+l)2=(2/w+z?)2+9,:.(2tn+n)2+2(2m+n)+1=(2m+n)2+9,*.2(2h+஻)=8,/.2/n+஻=4.