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2.4 1.25 0.3简算

1.4 1.25乘2.4用简便方法计算1.4 +1.25乘2.4=1.4+1.25*8*0.3=1.4+10*0.3=1.4+3=4.4

2.4*1.25*0.3=0.8*3*1.25*0.3=0.8*1.25*3*0.3=1*0.9=0.9

2.4/1.25=2.4/(10/8)=0.24*8=1.92

2.4*1.25*0.3=(0.8*1.25)*(3*0.3)=1*0.9=0.9

2.4*1.25*0.3=3*0.8*1.25*0.3=3*0.3*1=0.9842.4*6.7+8.24*31+0.824*20=8.24*(67+31+2)=8.24*100=824

被除数和除数同时乘以4.

2.4*1.25=3*0.8*1.25=3*1=3

2.4乘1.25=(2.5乘0.4)乘(6乘0.6)=1乘3.6=3.6

1.25x2.4=1.25x(4x0.6)=1.25x4x0.6=5x0.6=3

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