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312 4-122 4简便运算

312*4+188*4=(312+188)*4=500*4=2000

312*4+188*4=4*(312+188)=4*500=2000

解:312X4十188X4=(312+188)X4=500X4=2000

312*4+188*4怎么简便运算(1)312*4+188*4=(312+188)x4=(300+12+100+88)x4=(400+100)x4=500x4=2000(2)312*4+188*4=(300+12)x4+(200-12)x4=300x4+200x4+12x4-12x4=(300+200)x4=500x4=2000

312*4+118*4=(312+118)x4=(400+30)x4=400x4+30x4=1600+120=1720

=(312+188)*4 =500*4 =2000

解:采用结合律,原式=312+312x99=(1+99)x312=100x312=31200

25x9x4=25x4x9=100x9=900

=(75*4)*3=300*3=900

简便计算25x9X4=25x4x9=100x9=900

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