问题 解答题
求未知数X:
X+
1
6
X=7
80×
3
4
-
1
4
X=16
5
8
:X=
3
4
:6
1-
1
4
X=
3
4
答案

(1)X+

1
6
X=7,

7
6
x=7,

7
6
x÷
7
6
=7÷
7
6

x=6;

(2)80×

3
4
-
1
4
X=16,

60-

1
4
x=16

60-

1
4
x+
1
4
x=16+
1
4
x,

16+

1
4
x-16=60-16,

1
4
x=44,

1
4
x÷
1
4
=44÷
1
4

x=176;

(3)

5
8
:x=
3
4
:6,

3
4
=
5
8
×6,

3
4
=
15
4

3
4
÷
3
4
=
15
4
÷
3
4

x=5;

(4)1-

1
4
x=
3
4

1-

1
4
x+
1
4
x=
3
4
+
1
4
x,

3
4
+
1
4
x=1,

3
4
+
1
4
x-
3
4
=1-
3
4

1
4
x=
1
4

1
4
x÷
1
4
=
1
4
÷
1
4

x=1.

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