问题 解答题
脱式计算
①163+20020÷70-70②1.56÷5.2×1.8÷0.12
③10-(
3
8
+
1
2
3
8
④6.8÷[(1.55+0.15)×50%].
答案

①163+20020÷70-70,

=163+286-70,

=449-70,

=379;

②1.56÷5.2×1.8÷0.12,

=0.3×1.8÷0.12,

=0.54÷0.12,

=4.5;

③10-(

3
8
+
1
2
3
8

=10-

7
8
÷
3
8

=10-

7
3

=7

2
3

④6.8÷[(1.55+0.15)×50%],

=6.8÷[1.7×50%],

=6.8÷0.85,

=8.

单项选择题
单项选择题