Question

6.42ⅹ4.6+5.1ⅹ6.42简算？

Answer 1

6.42X4.6+5.1ⅹ6.42
二29.532+5.1x6.42
二29.532+32.742
二62.274

Answer 2

题目是6.42*4.6+5.1*6.42
6.42*4.6+5.1*6.42
解：原式=6.42*（4.6+5.1）
=6.42*（9.7）
=62.274

Answer 3

解：简便方法，提取因式
6.42X4.6+5.1X6.42=6.42X(4.6+5.1)=6.42X9.7=62.274

Answer 4

原式=6.42x(4.6+5.1)
=6.42x9.7
=6.42x(10－0.3)
=6.42ⅹ10－6.42x0.3
=64.2－1.926
=62.274

Answer 5

两个乘法式子里都有相同的数字6.42,所以可以用乘法结合律即6.42×4.9+5.1×6.42=6.42×(4.9+5.1)=6.42×10=64.2,书上是4.9非4.6