题目内容
解方程或解比例
| 6×3-1.8x=7.2 | 10:x=4.5:0.8 |
|
(1)6×3-1.8x=7.2,
18-1.8x=7.2,
18-1.8x+1.8x=7.2+1.8x,
18=7.2+1.8x,
18-7.2=7.2+1.8x-7.2,
10.8=1.8x,
10.8÷1.8=1.8x÷1.8,
x=6;
(2)10:x=4.5:0.8,
4.5x=10×0.8,
4.5x=8,
4.5x÷4.5=8÷4.5,
x=
;
(3)
:
=x:
,
x=
×
,
x=
,
x÷
=
÷
,
x=
.
18-1.8x=7.2,
18-1.8x+1.8x=7.2+1.8x,
18=7.2+1.8x,
18-7.2=7.2+1.8x-7.2,
10.8=1.8x,
10.8÷1.8=1.8x÷1.8,
x=6;
(2)10:x=4.5:0.8,
4.5x=10×0.8,
4.5x=8,
4.5x÷4.5=8÷4.5,
x=
| 16 |
| 9 |
(3)
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 10 |
| 1 |
| 8 |
| 1 |
| 4 |
| 1 |
| 10 |
| 1 |
| 8 |
| 1 |
| 40 |
| 1 |
| 8 |
| 1 |
| 8 |
| 1 |
| 40 |
| 1 |
| 8 |
x=
| 1 |
| 5 |
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