问题 解答题
求未知数
1
4
X+
1
2
X=
5
8
6
5x
=
2.4
3.8+1.2
3.2X-4×3=52.
答案

(1)

1
4
X+
1
2
X=
5
8

1
4
+
1
2
)X=
5
8

3
4
X=
5
8

3
4
4
3
=
5
8
×
4
3

X=

5
6

(2)

6
5x
=
2.4
3.8+1.2

5x×2.4=6×5,

12x=30,

12x÷12=30÷12,

x=2.5;

(3)3.2X-4×3=52,

3.2X-12=52,

3.2X-12+12=52+12,

3.2X=64,

3.2X÷3.2=64÷3.2,

X=20.

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