Question

7.81×3.1+6.9×4.29+3.52×6.9的简便计算是什么？

Answer 1

因为后两个乘式中都有6.9，所以原式等于7.81×3.1+6.9×（4.29+3.52）＝7.81×3.1+6.9×7.81＝7.81×（3.1+6.9）=78.1

Answer 2

简便计算过程如下:

7.81×3.1+6.9×4.29+3.52×6.9
=7.81×3.1+6.9×（4.29+3.52）
=7.81×3.1+6.9×7.81
=7.81×（3.1+6.9）
=7.81×10
=78.1

你好，本题已解答
如满意，请点采纳

Answer 3

如题，列出题中式子：
7.81*3.1+6.9*4.29+3.52*6.9
=7.81*3.1+6.9*（4.29+3.52）
=7.81*3.1+6.9*7.81
=7.81*（3.1+6.9）
=7.81*10
=78.1
所以最终答案为78.1

Answer 4

7.81x3.1+6.9x4.29+3.52x6.9的简便计算方法是：7.81x3.1+6.9x(4.29+3.52)=7.81x3.1+6.9x7.81=7.81x(3.1+6.9)=7.81x10=78.1

Answer 5

因为后两个乘式中都有6.9，所以运用乘法分配律逆运算就是7.81×3.1+6.9×（4.29+3.52）=7.81×（3.1+6.9）=78.1