Question

1.25x0.59x0.8简便算法.9.8x25 0.32x1.25 0.4x2.5x12.5x0.8

Answer 1

1.25×0.59×0.8

=1.25×0.8×0.59

=1×0.59

=0.59

9.8×25 =（10-0.2）×25

=10×25-0.2×25

=250-5

=245

0.32×1.25

=0.4×0.8×1.25

=0.4×（0.8×1.25）

=0.4

0.4×2.5×12.5×0.8

=（0.4×2.5）×（12.5×0.8）

=1×10

=10