Question

3.6×2.8 2.5×2.8 3.9×2.8的简便计算？

Answer 1

3.6×2.8+2.5×2.8+3.9×2.8
=2.8x(3.6+2.5+3.9)
=2.8x10
=28
望采纳，谢谢

Answer 2

因为三个乘式中都有2.8所以运用乘法分配律逆运算就是2.8×（3.6+2.5+3.9）＝2.8×10＝28

Answer 3

题目有错。在2.8与2.5之间和2.8与3.9之间应该是写漏了运算符号“+”。
3.6x2.8+2.5x2.8+3.9x2.8
=(3.6+2.5+3.9)x2.8
=10x2.8
=28。

Answer 4

3.6x2.8十2.5x2.8十3.9x2.8
=〈3.6十2.5十3.9）x2.8
=10x2.8
=28

Answer 5

此题可以用乘法分配律进行简便计算
3.6×2.8+ 2.5×2.8 +3.9×2.8
=（3.6+2.5+3.9）x2.8
=10x2.8
=28