Question

9.4乘以0.12 0.6乘以0.3简便方式是什么？

Answer 1

你看 你的题目应该是这样的吧
9.4×0.12+0.6×0.3
=（10-0.6）×0.12+0.6×0.3
=1.2-0.6×0.12+0.6×0.3
=1.2+0.6×（0.3-0.12）
=1.2+0.6×0.18
=1.2+0.6×（0.2-0.02）
=1.2+0.12-0.012
=1.308

Answer 2

3.4×9+99×0.6
=3.4×（10-1）+（100-1）×0.6
=34-3.4+60-0.6
=（34+60）-（3.4+0.6）
=94-4
=90
3.4×9+99×0.6
=3.4×9+（90+9）×0.6
=3.4×9+90×0.6+9×0.6
=3.4×9+9×0.6+90×0.6
=（3.4+0.6）×9+54
=4×9+54
=36+54
=90