问题 解答题
计算:
(1)
4
9
×
15
16
÷
5
6
(2)
1
2
1
5
=
1
4
:x
(3)
19
20
+0.25+5%+
3
4
(4)解方程
11
12
x-
x
120%
=65.
答案

(1)

4
9
×
15
16
÷
5
6

=

5
12
÷
5
6

=

1
2

(2)

1
2
1
5
=
1
4
:x

1
2
x=
1
5
×
1
4

1
2
x÷
1
2
=
1
20
÷
1
2

x=

1
10

(3)

19
20
+0.25+5%+
3
4

=(

19
20
+5%)+(0.25+
3
4

=1+1

=2;

(4)

11
12
x-
x
120%
=65

1
12
x=65

1
12
x÷
1
12
=65÷
1
12

x=780.

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