问题 解答题
脱式计算,能简算的要简算.
13
15
÷(
1
4
+
2
5
)

3
4
-
3
4
÷3

12
5
×(
5
6
+
3
4
)+
1
5

④98%×981+0.02×981.
答案

13
15
÷(
1
4
+
2
5
),

=

13
15
÷
13
20

=

4
3

3
4
-
3
4
÷3,

=4-

1
4

=3

3
4

12
5
×(
5
6
+
3
4
)+
1
5

=

12
5
×
5
6
+
12
5
×
3
4
+
1
5

=2+

9
5
+
1
5

=2+(

9
5
+
1
5
),

=2+2,

=4;

④98%×981+0.02×981,

=(98%+0.02)×981,

=1×981,

=981.

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