问题 解答题
正确、合理、灵活的计算下面各题.
1
2
+
1
3
-
5
6
)×1.2
0.25×32×1.25
1
5
×7.5+(1-
4
5
)÷
2
5
2
3
5
×1.25+1
1
4
×2.4-125%
15
16
×(
7
8
-
1
4
)÷
1
2
答案

(1)(

1
2
+
1
3
-
5
6
)×1.2,

=

1
2
×1.2+
1
3
×1.2-
5
6
×1.2,

=0.6+0.4-1,

=1-1,

=0;

(2)0.25×32×1.25,

=(0.25×4)×(8×1.25),

=1×10,

=10;

(3)

1
5
×7.5+(1-
4
5
)÷
2
5

=

1
5
×7.5+
1
5
÷
2
5

=(7.5+

5
2
)×
1
5

=10×

1
5

=2;

(4)2

3
5
×1.25+1
1
4
×2.4-125%,

=(2

3
5
+2.4-1)×1
1
4

=4×1

1
4

=5;

(5)

15
16
×(
7
8
-
1
4
)÷
1
2

=

15
16
×
5
8
÷
1
2

=

75
128
÷
1
2

=1

11
64

单项选择题
单项选择题