问题 解答题
求未知数X
4.5X÷3=2.25
X-
3
20
X=8.5
0.5:
1
4
=
2
3
X.
答案

(1)4.5X÷3=2.25,

4.5X÷3×3=2.25×3,

4.5x÷4.5=6.75÷4.5,

x=1.5;

(2)X-

3
20
X=8.5,

17
20
x=8.5,

17
20
x÷
17
20
=8.5÷
17
20

x=10;

(3)0.5:

1
4
=
2
3
X,

1
4
×
2
3
x=0.5×1,

1
6
x÷
1
6
=0.5÷
1
6

x=3.

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