Question

2.3+5.7×(10-0.7)简便运算？

Answer 1

计算如下：
2.3+5.7×(10-0.7)
=2.3+5.7×9.3
=2.3+53.01
=55.31

Answer 2

=2.3+（6-0.3）×（10-0.7）
=2.3+6×10-6×0.7-0.3×10+0.3×0.7
=2.3+60-4.2-3+0.21
=55.31