Question

2.9×2.9+2.9×1.4+4.3×7.1的简便简便计算方式怎么计算？

Answer 1

解:2.9×2.9+2.9×1.4+4.3×7.1=2.9×(2.9+1.4)+4.3×7.1=

2.9×4.3+4.3×7.1=4.3×(7.1+2.9)=4.3×10=43

Answer 2

解：原式=2.9×(2.9+1.4)+4.3×7.1=2.9×4.3+4.3×7.1=4.3×(2.9+7.1)=4.3×10=43

希望可以帮到你

Answer 3

解：2.9X2.9+2.9X1.4+4.3Ⅹ7.1
=2.9X（2.9+1.4）+4.3x7.1
=2.9x4.3+4.3x7.1
=4.3x（2.9+7.1）
=4.3Ⅹ10
=43

Answer 4

可以用结合律ab+bc=b×(a+c)
2.9×2.9+2.9×1.4+4.3×7.1
=(2.9+1.4)×2.9+4.3×7.1
=4.3×2.9+4.3×7.1
=(2.9+7.1)×4.3
=10×4.3
=43

Answer 5

因为前两个乘式中都有2.9，所以运用乘法分配律就是2.9×（2.9+1.4）+4.3×7.1=4.3×2.9+4.3×7.1=4.3×（2.9+7.1）=4.3×10=43