问题 解答题
解方程.
5X-3×
10
7
=
7
5

5-
2
3
X=
1
3

2X+40%X=7.2
5×(X-
1
3
)=2.
答案

(1)5X-3×

10
7
=
7
5

5X-

30
7
=
7
5

5X-

30
7
+
30
7
=
7
5
+
30
7

5X÷5=

199
35
÷5,

X=1

24
175

(2)5-

2
3
X=
1
3

5-

2
3
X+
2
3
X
=
1
3
+
2
3
X

5-

1
3
=
1
3
+
2
3
X
-
1
3

4

2
3
×
3
2
=
2
3
3
2

X=7;

(3)2X+40%X=7.2,

2.4X=7.2,

2.4X÷2.4=7.2÷2.4,

X=3;

(4)5×(X-

1
3
)=2,

5×(X-

1
3
)÷5=2÷5,

X-

1
3
+
1
3
=
2
5
+
1
3

X=

11
15

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