问题 解答题
求未知数X:
2X-
1
2
=0.5
X+
5
4
X=
27
16
2:X=
4
5
0.36:X=
1
10
4
9
答案

(1)2X-

1
2
=0.5,

2X-

1
2
+
1
2
=0.5+
1
2

2X=1,

2X÷2=1÷2,

X=

1
2

(2)X+

5
4
X=
27
16

9
4
X=
27
16

9
4
4
9
=
27
16
×
4
9

X=

3
4

(3)2:X=

4
5

X=2×

4
5

X=

8
5

(4)0.36:X=

1
10
4
9

1
10
X=0.36×
4
9

0.1X=0.1,

0.1X÷0.1=0.1÷0.1,

X=1.

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