问题 解答题
解方程
(1)
3
4
x+
1
2
×
3
4
=1

(2)x×(
3
4
-
2
3
)=
2
3
(3)X:42=
5
7
:10
(4)
1.2
2
=
X
5
答案

(1)

3
4
x+
1
2
×
3
4
=1,

3
4
x+
3
8
=1,

3
4
x+
3
8
-
3
8
=1-
3
8

3
4
x=
5
8

3
4
4
3
=
5
8
×
4
3

x=

5
6

(2)x×(

3
4
-
2
3
)=
2
3

1
12
x=
2
3

1
12
x×12=
2
3
×12,

x=8;

(3)X:42=

5
7
:10,

10X=42×

5
7

10X÷10=30÷10,

X=3;

(4)

1.2
2
=
X
5

2x=1.2×5,

2x÷2=6÷2,

x=3.

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