带中括号的脱式计算含答案（带中括号小括号的脱式计算）

1） 8×4/7÷[1÷(3.2-2.95)]

=8×4/7÷[1÷0.25]

=8×4/7÷4

=8/7

2）20×[(2.44－1.8)÷0.4＋0.15]

= 20x (0.64 ÷0.4 +0.15)

= 20x(1.6 +0.15)

= 20 x1.75 = 35

3）0.8×[(10－6.76)÷1.2]

= 0.8 x(3.24÷1.2)

= 0.8 x 2.7

= 2.16

4）0.8×〔15.5-(3.21+5.79)〕

= 0.8 x (15.5 - 9)

= 0.8 x 6.5

= 5.2

5）70×〔（42-42）÷18〕

=70 x (0÷18)

= 70x0

= 0