Question

7.8×5.6+2.2×5.6简便计算？

Answer 1

本题主要用到运算定律的乘法结合律，发现7.8+2.2刚好等于10，所以可以先将两数想加，然后才算乘法
=（7.8+2.2）×5.6
=10×5.6
56

Answer 2

=7.8X5.6+2.3X(10-5.6) =7.8X5.6+23-2.3X5.6 =(7.8-2.3)X5.6+23 =5.5X5.6+23 =(5+0.5)X(5+0.6)+23 =25+2.5+3+0.3+23 =53.8请点右下角“采纳答案”,支持一下.

Answer 3

7.8×5.6+2.2×5.6
=（7.8+2.2）×5.6
=10×5.6
=56