题目内容

解比例
49:(5+x)=14:20.8:x=
3
5
:0.75
45
8
=
2+x
0.8
3.2
7
=
x+8
5
x:3.6=
3.2
1.8
2
5
5
7
=x:
3
14
(1)49:(5+x)=14:2
49×2=5×14+14x
98-70=70+14x-70
28÷14=14x÷14
x=2;

(2)0.8:x=
3
5
:0.75
3
5
x=0.8×0.75
3
5
x÷
3
5
=0.6÷
3
5

x=1;

(3)
45
8
=
2+x
0.8

45×0.8=8×2+8x
36-16=16+8x-16
20÷8=8x÷8
x=2.5;

(4)
3.2
7
=
x+8
5

3.2×5=7x+7×8
16-56=7x+56-56
-40÷7=7x÷7
x=-5
5
7


(5)x:3.6=
3.2
1.8

1.8x=3.6×3.2
1.8x÷1.8=11.52÷1.8
x=6.4;

(6)
2
5
5
7
=x:
3
14

5
7
x=
2
5
×
3
14

5
7
x÷
5
7
=
3
35
÷
5
7

x=
3
25
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