脱式计算，能简算的简算:8.56-1.56x0.5、1.25x3.2x2.5

Question

如题所述

Answer 1

8.56-1.56x0.5
=8.56x0.5-1.56x0.5+8.56x0.5
=7x0.5+8.56x0.5
=15.56×0.5
=7.78追答

1.25x3.2x2.5
=1.25x8x(0.4x2.5)
=10x1
=10

Answer 2

8.56-1.56x0.5
=7+1.56-1.56x0.5
=7+1.56x(1-0.5)
=7+1.56x0.5
=7+0.78
=7.78

1.25x3.2x2.5
=1.25x(8x0.4)x2.5
=(1.25x8)x(0.4x2.5)
=10x1
=10本回答被网友采纳