Question

2.7除以，括号1-20%-50%，括号的简便计算。

2.7除以，括号1-20%-50%，括号的简便计算。

Answer 1

解：2.7/(1一20%一50%)
=2.7/(1一0.20一0.50)
=2.7/(1一0.70)
=2.7/0.30
=9

Answer 2

1-20%-50%=30%
2.7除以30%等于0.81

Answer 3

解: 2.7÷(1-20%-50%)
=2.7÷30%
=2.7÷0.3
=9