Question

数学题解答用简便方法计算下面各题. 2.5x4.4 32x0.25x12.5 3.64x0.8+6.36x0.8-3.8

2.5x4.4 32x0.25x12.5 3.64x0.8+6.36x0.8-3.8

Answer 1

2.5x4.4=0.25*44=44/4=11

32x0.25x12.5=(8*4)*0.25*12.5=(4*0.25)*(8*12.5)=1*100=100

3.64x0.8+6.36x0.8-3.8=0.8*(3.64+6.36)-3.8=0.8*10-3.8=8-3.8=4.2

Answer 2

2。5×4.4
=2.5×4+2.5×0.4
=10+1
=11

32×0.25×12.5
=（4×0.25）×（8×12.5）
=1×100
=100

3.64×0.8+6.36×0.8-3.8
=0.8×（3.64+6.36）-3.8
=8-3.8
=4.2