Question

2.31×3.7+23.1×0.64-0.231简便计算

Answer 1

解题思路：

23.1=2.31×10

0.231=2.31×0.1

解题过程：

2.31×3.7+23.1×0.64-0.231

=2.31×3.7+2.31×（10×0.64）-2.31×0.1

=2.31×3.7+2.31×6.4-2.31×0.1

=2.31×(3.7+6.4-0.1)

=2.31×10

=23.1

温馨提示：

(1)乘法分配律不仅适用于两个有共同因式的式子相加减，还适用于多个式子相加减。

(2)乘法分配律的重难点在于巧秒找出公因式

Answer 2

2.31×3.7+23.1×0.64-0.231
=2.31×3.7+2.31×10×0.64-0.231
=2.31×（3.7+6.4）-0.231
=2.31×10.1-0.231
=0.231×10×10.1-0.231×1
=0.231×（101-1）
=0.231×100
=23.1

Answer 3

2.31×3.7+23.1×0.64-0.231
=23.1×0.37+23.1×0.64-23.1×0.01
=23.1×(0.37+0.64-0.01)
=23.1