Question

4.42×0.6+2.21×0.8的简便计算？

Answer 1

因为2.21×0.8=2.21×2×0.4=4.42×0.4，所以原式等于4.42×0.6+4.42×0.4运用乘法分配律逆运算就是4.42×（0.6+0.4）=4.42

Answer 2

加减乘除的简便算法是提取公约数2.21得
2.21x(2x0.6+0.8)
=2.21x2
=4.42

Answer 3

4.42ⅹ0.6十2.21x0.8
=2.21ⅹ1.2十2.21x0.8
=2.21x(1.2十0.8)
=2.21x2
=4.42。