问题 解答题
合理灵活地计算下列各题.
46×8-120÷5
2
3
+(
4
5
-
2
3
)×
5
3
3.4×2.77+0.23×3.4
4
5
×7.7+3.3×0.8-80%
答案

(1)46×8-120÷5,

=368-24,

=346;

(2)

2
3
+(
4
5
-
2
3
)×
5
3

=

2
3
+(
12
15
-
10
15
)×
5
3

=

2
3
+
2
15
×
5
3

=

2
3
+
2
9

=

6
9
+
2
9

=

8
9

(3)3.4×2.77+0.23×3.4,

=3.4×(2.77+0.23),

=3.4×3,

=10.2;

(4)

4
5
×7.7+3.3×0.8-80%,

=(7.7+3.3-1)×0.8,

=10×0.8,

=8;

单项选择题
单项选择题