试题与答案

解方程.5+13X=13X÷92=12X-30%X=21X+(1-49)=5.

题型:解答题

题目:

解方程.
5+
1
3
X=13
9
2
=12
X-30%X=21X+(1-
4
9
)=5.

答案:

(1)5+
1
3
x=13,

5+

1
3
x-5=13-5,

1
3
x÷
1
3
=8÷
1
3

x=24;

(2)x÷

9
2
=12,

x÷

9
2
×
9
2
=12×
9
2

x=54;

(3)x-30%x=21,

70%x=21,

70%x÷70%=21÷70%,

x=30;

(4)x+(1-

4
9
)=5,

x+

5
9
-
5
9
=5-
5
9

x=4

4
9

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