问题 解答题
解方程:
(1)χ-72%χ=56
(2)60%χ-35%χ=125
(3)Χ-
3
4
Χ=
2
9
(4)25%Χ+
1
2
Χ=15
答案

(1)χ-72%χ=56,

0.28χ=56,

0.28χ÷0.28=56÷0.28,

χ=200;

(2)60%χ-35%χ=125,

0.25χ=125,

0.25χ÷0.25=125÷0.25,

χ=500;

(3)Χ-

3
4
Χ=
2
9

1
4
X=
2
9

1
4
1
4
=
2
9
÷
1
4

X=

8
9

(4)25%Χ+

1
2
Χ=15,

0.75X=15,

0.75X÷0.75=15÷0.75,

X=20.

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