小学四年级下数学教案

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ᦟᫀ20092010

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22ᦟᫀ2010ᨴ⚪ñᔣóô1ᜓõö1ஹ÷jᐹùḄúû)¸³ñᔣóüýHêëôḄ|ᵨ஺ᦟ2ஹ]᪷ÒìNñᔣWüýêëᱥùḄô஺3ஹJÿ
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23ᦟ6789:5£¿ᨵÀÁ᪗!"PᨵYZµ²³Ãᕖ]Åƾᙢ5PGYZ]`aÇ;Dz³஺ᔢᙠᜧW⃩ªᓅ30+Èஹ¼᪗@w1ஹn?B(1)ஹfɼÊvwË;Ë஺ÌÍ…Ḅ'(Qª+!"ɼÊᓟ¹஺ÏÐ…Ḅ'(Qª+!"ɼÊᓟ¹஺ÑÉ‷Ḅ'(Qª+!"ɼÊᓟ¹஺(2)ஹfᵯÔᛞvwᢥ⌕×Ë஺ᦻᓄÚÛᙠᵯÔᛞ«ªᓭ45+Ḅᔣ;&ÝÛᙠᵯÔᛞªᓭ30+Ḅᔣ;Þᱥ✂ᙠᵯÔᛞªᓭ60+Ḅᔣ;ᱥàᙠᵯÔᛞᓅª«40+Ḅᔣ஺2ஹáâãäåÛ⌕æçèpäå⚗LB•pᙠ붫ªᓅ40oᔣ£ì200¹ᜐæí;p“ïᨴ‧”ó;p“ᜩ᜜ᩭ÷”ᙠë¶ᓭª20஺ᔣ£ì150¹ᜐ஺øPᙠù☢5£᪗Fpæ⚗L᪗B'(஺3ஹû(⚜?஺⚜?¦2

24ᦟᫀ2010
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26ᦟᫀ2010&ᨴ()*⚪ᔣ,3ᜓ./011ஹ45ᦟ
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27ᦟ
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28ᦟᫀ2010&ᨴ()*⚪ᔣ,4ᜓ./011ஹkᵨ¯°xyìᓫḄîïKðᙠᔠ\ñòkóᑴìᓫḄîï஺ᦟ2ஹLCîïᙠm▭^Ḅö÷øᵨ஺
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29ᦟ+,-./0ঝ§9ᐹ!"F©9ª$ᐜᔣsᔣJkmᑮ1,¬ᔣsᔣJkmᑮ2,ᨬ®ᔣsᔣJkmᑮ¢஺|ஹ^᪗¯
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30ᦟᫀ2010ÀᨴÂÃÄ·⚪ÅÆÇᣚÉஹÅÆ7ᔠÉ·f1ᜓ·%ËÌÍᦟ1ஹÎÏABYᳮÑÅÆÇᣚÉஹ7ᔠÉ஺2ஹÒÓ᪷ᐹÔÕ$⌱×ØÆḄ/Ù{ÚÛ$ªÜ¾ÝḄᮣßឋ஺_3ஹáâãᦪ{:åßḄὶç$ÚᵨᡠèÙÑéᓫḄå▭;⚪஺᪗ABYᳮÑÅÆÇᣚÉஹ7ᔠÉ஺ëÚ᪷ᐹÔÕ$⌱×ᔠ〉ḄØÆ஺ᦟ3⚪#ᦟ+,-./0ஹ23⚜51ஹ¯í⚜567⚜58Ḅ;⚪$5_᪗஺2ஹ3⚪#ÎᐭF3⚪#$᪷ᩩðñ9;⚪(1)òóóôᜩᐳ÷tuᓟxV(2)òóó|ᜩᐳ÷tuᓟxVÎÏ3⚪#ᦟù᪷ñ9Ḅ;⚪¹º஺>ஹᔠ@ABú5ûᵨ2üḄÆᑡ9þᔠØÿ
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31ᦟ8`abcd%&ᑮḄ?@஺ᦟ6'ᐜghA-ᦪiBᡈὅᐜglA-ᦪiBHIJ஺.KLKM&ᔠ@஺ᵨQRSTḄU⊤WBM&ᔠ@஺᪷3.A-no@+pqrḄ01஺sஹt᪗vw1ஹyz{|'P28/LLஹP31/4,12ஹN&N&⁚|ḄBMḄno@஺ᜩ.⁚9:ᨵ<=ᦈ>9Og.pnᵨlḄ|rᔩ>ஹG⚜|⚜|03BMḄno@(1)ᜩᐳ;ᓟ>(2)sᜩᐳ;ᓟ>40+56=96(ᓟ)56+40=96(ᓟ)88+104+96104+96+886=192+96=200+88=288(ᓟ)=288(ᓟ)40+56=56+40(88+104)+96=88+(104+96)A-BᦪDᣚFGHIJ஺ᐜghA-ᦪiBᡈὅᐜglA-ᦪiB.KLBMDᣚ@஺HIJ஺.KLBM&ᔠ@஺a+b=b+a(a+b)+c=a+(b+c)ᦟ

32ᦟᫀ2010ᨴ¡¢⚪BMno@Ḅnᵨ£2ᜓ¥¦§¨1ஹOnᵨno@45pª«n஺ᦟ2ஹ¬᪷3ᐹ¯°±⌱³MḄc´µO¶·¸Ḅᮣqឋ஺©᪗3ஹ»¼½ᦪµ¾qḄὶÀOᵨᡠ´
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33ᦟ8`abcdñOêòó⚪ᨵôõᦟñbö#$BMr÷;øùúᙢ¯nûüᡠ⌕BNòó஺ýᵨᑮ;BMDᣚ@þᵨᑮ;BM&ᔠ@஺.⍝⚪ᡃᵨḄᙠᣚᔠᵨḄ஺!ஹ#᪗%&1ஹ'()*P30/+,+2ஹ-./01.*Ḅᑁ34567Ḅᦈ9:⁚<=ᨵᦈ9?ஹ@A:P32/5—7ḄᵨCᢥ᯿ᑜIJJᙠKLᜩN⌕PQRᓟTD115+132+118+85E=115+85+132+118-ᣚ=(115+85)+(132+118)-ᔠ=200+250=450(ᓟT)ᦟ.YZ

34ᦟᫀ2010]ᨴ_`a<⚪bᣚஹbᔠ<3ᜓ

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36ᦟᫀ2010]ᨴ_`a<⚪bᑖú<4ᜓ6ᐳᨵ%92
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38ᦟᫀ2010´ᨴ¶·¸¹⚪;ᑖyḄ§ᵨ¹»5ᜓ¹21ஹ!"#$j¿ᵨ;ᑖyde6ÀÁ¿.஺ᦟ#2ஹÂÃ#$᪷aᐹÅÆÇ⌱É.Ḅ]ÊjË̯ÍḄᮣឋ஺¾᪗3ஹÐ#$ÑÒᦪ#Ó$ḄὶWjᵨᡠ#ÕÊᓫḄÓ▭Ø⚪஺Ùj¿ᵨ;ᑖyde6ÀÁ¿.஺UÚ#$᪷aᐹÅÆÇ⌱É.Ḅ]ÊjË஺UᦟÝ.ᓱ#ÛÜᦟ#YZ[\]^6ஹ¤ß⚜¡=@O1.Ý.O73+27138x100100-6464x18x9x125(4+40)X252.ᙠÝëìí〉ïḄᦪ஺302=300+Ý(300+2)X43=300X0+2X02003=2000+0(2ooo+3)x14=2000xn+nxnஹᔠᡃLòó#¡
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40ᦟᫀ2010ᨴ⚪>ឋஹ◀>ឋ6ᜓ¢1.¤⍝BLGᦪ\¦§ᡈ◀8FGᦪ
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72ᦟᫀ2010ÉᨴËÌÍÎ⚪@ᦪefTḄ¾¿Î+ᜓÎ1ஹÑÒ@ᦪefTḄTᑣefTᐵÔuÕÖ@ᦪefT×ᵨ⚪஺ᦟ2ஹÙÚM⚪zÛ஺3ஹ£ÜÝÞḄ¿¿ß஺Ð᪗^@ᦪefTTᑣefTᐵÔ஺_àᵨTᑣáâWX஺_ᦟãäᦟ3[j0ஹ¾¿åD1ஹ@ᦪefTḄST:;>2ஹ¡X1ᑡᔜ⚪0.7+0.94.7-0.50.56-0.461.2+0.81-0.40.39+0.157.7+0.63.6-0.84.8-35.7+0.23.6-1.67+2.33ஹÃç1☢ᔜ⚪uçX8.02+15.28108.5-35.0525-16.07ÙèD@ᦪefT᝞"WXᕖ>éஹêXë¿1ஹìᡂ1⊤uRR79Mᑮ:;<=஺(ᓫmᐗ)ᶍ2ஹ᪷I<=RR79Mᑮ:;>3ஹᵨ@ᦪWX1☢ᔜ⚪ᶍஹMè⚪1ஹðññ0ᜩᓬóḄᦈᐭ᝞1⊤஺ᶍ(1)öó÷ø³ᓬ³´ù>(2)7zÙú:;ᦪè⚪>2ஹû⌕ü05ýᳫ05᣸ᳫ.

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74ᦟᫀ2010DᨴFGHI⚪0ᦪᑣ3ᔠ56IJᜓIL1ஹOPQRST0ᦪᑣ3ᔠ56Ḅ56UVWX:60ᦪ;<<3ᔠᦟ56஺2ஹᙠᦟ[\]^_`PḄ:6Qa஺M3ஹcdPḄ(ᐶf஺᪗ghST0ᦪᑣ3ᔠ56UV.ihᦟᢗmᱏ.jkᦟ—"ஹqr⚜(1ஹst⚜(஺2ஹu60.2+0.33.5+2.48.7-4.51-0.60.9-0.52.3+5.44.9+18.6-5.50.7+0.86.7+1.15+6.59.7-73ஹᐜ☢ᔜ⚪Ḅ56UVWᙠ:6.7325-714+146-8910000-981-326+1484ஹᐭ:0ᦪ;3ᔠ56ḄUV᦮ᦪ;3ᔠ56ḄUV.ஹᔠ1ஹ9⚪஺1qjᧇ᝞⊤஺2#ᜩ2Ḅ¡"¢)W⌕£ᡂWq5¥ᕒ§⌕¨ᓟª2ஹ0«ᔠ⌕¬1ᐜXᨵ¯°±<⚪஺2ᑖ³ᔠWᵨµḄ±<஺3¶J·¸ᵨᑮ)*+º,-஺3ஹ»¼஺1483.4-39.5+98.8=483.4-138.3=345.1ᓟª

75ᦟ(2)165+80.7+99.4=245.7+99.4=345.1(ᓟª)(3)483.4-39.5-98.8=443.9-98.8=345.1(ᓟª)ÀஹÁ᪗sÂ1ஹÃ].ÃᐜÄ56UVWÅ:6.185.07-15.3+94.3-4.3099.26-(8.9-<3.96+13))22.8+5.23-9.125+14.7532.5-(5.07+6.13)+8.252ஹ⚪(1)᪷ÇÈWÉ·ᾠËÌ)ª(2)ᙢᳫ⊤☢ÎÏ5.1ÐѱᓟªWᐸ[▮ᙢ☢ÎÏ1.49Ðѱᓟª஺ÔÕ☢Î▮ᙢ☢ÎÐѱᓟª3ஹ!"#ᜩᡃ&()*+Ö,-4ஹ⚜(0ᦪ;<Ḅ×60ᦪᑣ3ᔠ567483.4-(39.5+98.8)8=483.4-138.39=345.1(ᓟª):ᦟ>?

76ᦟᫀ2010DᨴFGHI⚪0ᦪ;<Ḅ×6IJ|ᜓIL1ஹᙠ(ST0ᦪ;<ØẠÚ(0ᦪ;<Ḅ×6஺ᦟ2ஹÛÜPḄÝ⚪Qa஺3ஹ_`PÞßḄ(à஺M᪗gᑨâ0ᦪ;<Ïᔲ×6஺hiXḄ\×6஺hᦟᢗmᱏjkᦟ]ஹqr⚜(1ஹu6(ᢗmᱏᡈuᓱ)0.35+0.50.26-0.160.25+0.175-2.57.24-6.88.5-53.6-1.62.1+7.913.5-2.46.7-2.34.8-2.87.1-42ஹᵨ×æ±<:6ᑡᔜ⚪Wè᪷Ç*+48+25+52+175120-75-25430-121-7936+11+64+8985-(15+64)3ஹst⚜(é஺ஹᔠ1ஹ9·¸,ᑮ)êëìíîïðñᵱPḄ50ªóᡂôᨬßWö&÷4X50ªùaWQḄ!ᡂôÏᕖ2ஹ0«ᔠ£ᡂ(1)᪷Ç⚪MX¶±<(2)ᑏĶWèᳮᵫ3ஹ»¼(1)8.42+8.46+8.54+8.58=16.88+8.54+8.58=25.42+8.58=34(þ)

77ᦟ(2)8.42+8.46+8.54+8.58=(8.42+8.58)+(8.46+8.54)=17+17=34(þ)4ஹÿ
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