问题 解答题
解方程.
①1-
1
4
x=
1
4

②0.4:0.25=
12
x
答案

(1)1-

1
4
X=
1
4

1-

1
4
X+
1
4
X=
1
4
+
1
4
X

1
4
+
1
4
X=1,

1
4
+
1
4
X-
1
4
=1-
1
4

1
4
X=
3
4

1
4
1
4
=
3
4
÷
1
4

X=3;

(2)0.4:0.25=

12
X

0.4X=0.25×12,

0.4X=3,

0.4X÷0.4=3÷0.4,

X=7.5.

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