Question

2.6×3.5-3.4怎么简便计算

Answer 1

你好！2.6×3.5-3.4简便计算方法如下：

1. 先把3.4变成和乘法算式有关联的算式，即：
3.4=3.5-0.1

2.再把3.5变成乘法算式，即：
3.5=3.5×1

3.利用乘法结合律进行计算，即：
2.6×3.5-3.4
=2.6×3.5-（3.5-0.1）
=2.6×3.5-3.5+0.1
=2.6×3.5-3.5×1+0.1
=3.5×（2.6-1）+0.1
=3.5×1.6+0.1
=（0.7×5）×1.6+0.1
=0.7×（5×1.6）+0.1
=0.7×8+0.1
=5.6+0.1
=5.7

Answer 2

2.6x3.5-3.4=2.6x0.5x7-3.4=9.1-3.4=5.7，所以2.6x3.5-3.4等于5.7