问题 解答题
解方程或比例.
5
48
x-2=0.5     
x
8.1
=
4
10.8

③X:12=
7
4
:2.8.
答案

(1)

5
48
x-2=0.5,

5
48
x-2+2=0.5+2,

5
48
48
5
=2.5×
48
5

x=24;

(2)

x
8.1
=
4
10.8

10.8x=8.1×4,

10.8x÷10.8=32.4÷10.8,

x=3;

(3)x:12=

7
4
:2.8,

2.8x=12×

7
4

2.8x÷2.8=21÷2.8,

x=7.5.

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