问题 解答题
解方程.
χ-
3
5
χ=
6
5
0.25+25%x=1.5
1
2
X-
4
5
=
1
5
4.5x-
1
2
x=6.
答案

(1)X-

3
5
X=
6
5

(1-

3
5
)X=
6
5

2
5
X=
6
5

2
5
5
2
=
6
5
×
5
2

X=3;

(2)0.25+25%x=1.5,

0.25+0.25x-0.25=1.5-0.25,

0.25x=1.25,

0.25x÷0.25=1.25÷0.25,

x=5;

(3)

1
2
X-
4
5
=
1
5

1
2
X-
4
5
+
4
5
=
1
5
+
4
5

1
2
X=1,

1
2
X×2=1×2,

X=2;

(4)4.5x-

1
2
x=6,

(4.5-

1
2
)x=6,

(4.5-0.5)x=6,

4x=6,

4x÷4=6÷4,

x=1.5.

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