2021-2022学年山东省济宁市微山县八年级（上）第二次调研数学试卷（附答案详解）

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2021-2022
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11=(2a+b)2|(2)9a2(x—y)+4Z?2(y—x)=(%—y)(9a2—4b2)=(x-y)(3a+2b)(3a-2b)|(3)-2a3+12a2-18a=-2a(a2—6a+9)———2a(cz—3)2.ூ"᪆௃(1)ᐜwrᓄ᦮ᳮᯠZᑭᵨᐰrᑖ"ᓽ"'|(2)ᐜ¡¢Zᑭᵨ£¤ᑖ"ᓽ"'|(3)ᐜ¡¢Zᑭᵨᐰ£¤ᑖ"ᓽ"'.⚪ὃ¡¢gḄ¥ᔠnᵨ¦m⌕§᝞¨e⚗Ḅᔜ⚗«ᨵ¢®ᐜ¡¢.19.ூ'ᫀ௃(l)(3a+b)(2a+b)-(a+b)2=(6a2+5ab+b2)—(a2+2ab+h2)=5a2+3ab(2)¯a=3,b=2°w=5X32+3x3X2=63.ூ"᪆௃(1)±ᓄḄ☢=²]Ḅ☢-³´µᑖḄ☢᪷U¶ᑡ`¸ᦪ.(2)¹a=3ºb=2º¸ᐭ(1)ᡠWḄ¸ᦪ½`".⚪ὃᑡ¸ᦪ¸ᦪ½¾,ᐵ$¿⍝ᐰ,Á]Ḅឋ_᦮ḄÂᔠn¿ÃÄ.20.ூ'ᫀ௃জঝঞூ"᪆௃"+(1)1•,a+-=2,''a:.Q2+±=(Q+,)2—2=4-2=2|•+±=3+6-2=4-2=2|1r1ov(a--)2=(a+-)2—4=4—4=0,a--=0|a••ᡂËḄ!+জঝᦑ'ᫀO+জঝঞ.(2)va2-3a4-1=0,+Q++=3,,ᓲ+Í=(Q+1)2_2=9-2=7|

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