Question

0.62×20.1×0.62的简便运算叫什么？

Answer 1

0.62×20.1×0.62
=0.31*0.31*80.4
=0.31²*80.4
=（0.3*0.3+0.0001+0.006）*80.4
=0.0961*80.4
=（0.1-0.0039）*80.4
=（0.1-0.004+0.0001）*80.4
=8.04+0.00804-0.3216
=8.04804-0.3216
=8.02664-0.3
=7.72664

Answer 2

解：0.62×20.1×0.62
=0.62×（20+0.1）×0.62
=（12.4+0.062）×（0.6+0.02）
=7.44+0.248+0.0372+0.00124
=（7.44+0.248）+（0.0372+0.00124）
=7.688+0.03844
=7.72644

Answer 3

0.62×20.1×0.62
=0.62×（5×4.01）×0.62
=3.1×

Answer 4

可以拆分，目的是凑整
=(0.6+0.02)×(20+0.1)×0.62
=(12+0.4+0.06+0.002)×(0.6+0.2)
=(12+0.462)×(0.6+0.2)
=7.2+2.4+0.462×0.2
=9.6924