问题 解答题
直接写出计算结果
(1)若
3
4
x=42×25%+
1
2
x,则x=______;
(2)(24+
8
15
)÷1
3
5
+1÷9×
1
9
=______.
答案

(1)

3
4
x=42×25%+
1
2
x,

3
4
x-
1
2
x=42×25%+
1
2
x-
1
2
x,

1
4
x=10.5,

1
4
x÷
1
4
=10.5÷
1
4

x=42;

(2)(24+

8
15
)÷1
3
5
+1÷9×
1
9

=(24+

8
15
)×
5
8
+1÷9×
1
9

=24×

5
8
+
8
15
×
5
8
+
1
9
×
1
9

=15+

1
3
+
1
81

=15

28
81

故答案为:42,15

28
81

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