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302x83用简便方法计算

302x83=(300+2)x83=300x83+2x83=24900+166=25066

=(300+2)X83=300X83+2X83=24900+166=25066

302X83=(300十2)X83=300X83十2X83=24900十246=25146

302X40 =300+2*40 =300*40+2*40 =12000+80 =12080

302x43=300x43+2x43=12900+86=12986

302x28=(300+2)x28=300x28+2x28=8400+56=8456

(300+2)x(50+1)=300x50+2x50+300+2=15000+100+300+2=15402

列式为:302x18=(300+2)x18=300x18+2x18=5400+36=5436

302*41 =(300+2)*41=300*41+2*41=12300+82=12382

302x36=(300+2)x36=300x36+2x36=10800+72=10872 98x25=(1002)x25=100x25-2x25=2500-50=2450

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