问题 解答题
解方程.
1
3
x=
2
3
x+
2
5
x=49
10
21
=
10
21
答案

解;(1)

1
3
x=
2
3

1
3
x÷
1
3
=
2
3
÷
1
3

x=2;

(2)x+

2
5
x=49,

1.4x=49,

1.4x÷1.4=49÷1.4,

x=35;

(3)x÷

10
21
=
10
21

10
21
×
10
21
=
10
21
×
10
21

x=

100
441

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