Question

0.8×1.26-0.08的简便运算

Answer 1

0.8×1.26-0.08=0.8×1.26-0.8×0.1=0.8×（1.26-0.1）=0.8x1.16=0.8×1+0.8×0.2-0.8×0.04=0.8+0.16-0.032=0.96-0.032=0.928

Answer 2

0.8x1.26-0.08
=0.08x12.6-0.08
=(12.6-1)x0.08
=11.6x0.08
=(10+1.6)x0.08
=10x0.08+1.6x0.08
=0.8+0.128
=0.928
运用了加法结合律，做起来简便。