题目内容
解比例
| 49:(5+x)=14:2 | 0.8:x=
|
| ||||||||||||
| x:3.6=
|
|
(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=
:0.75
x=0.8×0.75
x÷
=0.6÷
x=1;
(3)
=
45×0.8=8×2+8x
36-16=16+8x-16
20÷8=8x÷8
x=2.5;
(4)
=
3.2×5=7x+7×8
16-56=7x+56-56
-40÷7=7x÷7
x=-5
;
(5)x:3.6=
1.8x=3.6×3.2
1.8x÷1.8=11.52÷1.8
x=6.4;
(6)
:
=x:
x=
×
x÷
=
÷
x=
.
49×2=5×14+14x
98-70=70+14x-70
28÷14=14x÷14
x=2;
(2)0.8:x=
| 3 |
| 5 |
| 3 |
| 5 |
| 3 |
| 5 |
| 3 |
| 5 |
| 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 |
| 3 |
| 14 |
| 5 |
| 7 |
| 2 |
| 5 |
| 3 |
| 14 |
| 5 |
| 7 |
| 5 |
| 7 |
| 3 |
| 35 |
| 5 |
| 7 |
x=
| 3 |
| 25 |
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