题目内容
解比例.
7.5:X=
=
X:
=26:3 (X+7):6=7:2.1.
7.5:X=
| 3 |
| 4 |
| 36 |
| x |
| 1.8 |
| 5 |
| 6 |
| 13 |
(1)7.5:x=
,
7.5:x=3:4,
3x=7.5×4,
3x÷3=30÷3,
x=10,
(2)
=
,
1.8x=36×5,
1.8x÷1.8=180÷1.8,
x=100,
(3)x:
=26:3,
3x=26×
,
3x÷3=12÷3,
x=4,
(4)(x+7):6=7:2.1.
2.1(x+7)=6×7,
2.1(x+7)÷2.1=42÷2.1,
x+7=20,
x+7-7=20-7,
x=13.
| 3 |
| 4 |
7.5:x=3:4,
3x=7.5×4,
3x÷3=30÷3,
x=10,
(2)
| 36 |
| x |
| 1.8 |
| 5 |
1.8x=36×5,
1.8x÷1.8=180÷1.8,
x=100,
(3)x:
| 6 |
| 13 |
3x=26×
| 6 |
| 13 |
3x÷3=12÷3,
x=4,
(4)(x+7):6=7:2.1.
2.1(x+7)=6×7,
2.1(x+7)÷2.1=42÷2.1,
x+7=20,
x+7-7=20-7,
x=13.
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