Question

5.6X9.9-5.6简便计算？

Answer 1

5.6X9.9-5.6
=5.6X（9.9-1）
=5.6X8.冇9
=5.6X（9-0.1）
=50.4-0.56
=49.84
加了《冇》字将可能有问题的数字隔开

Answer 2

回答：
5.6×9.9-5.6
=5.6×（10-0.1）-5.6
=56-0.56-5.6
=56-（0.56+5.6）
=56-6.16
=49.84
运用了乘法分配律

Answer 3

解；原式=5.6·（9.9-1）=5.6·8.9=5.6·（9-0.1）=5.6·9-5.6·0.1=50.4-0.56=49.84。

Answer 4

5.6X9.9-5.6
=5.6X（10-0.1）-5.6
=56-0.56-5.6
=56-1.16
=54.84

Answer 5

5.6×101 -5.6简便运算