题目内容
解比例或方程
X:40=2.5:4
:X=0.4:8
X-3.7+2.2=0.
X:40=2.5:4
| 1 |
| 4 |
| 3 |
| 7 |
x:40=2.5:4,
4x=40×2.5,
4x=100,
4x÷4=100÷4,
x=25;
(2)
:x=0.4:8,
0.4x=
×8,
0.4x=2,
0.4x÷0.4=2÷0.4,
x=5;
(3)
x-3.7+2.2=0,
x-3.7+2.2+3.7=0+3.7,
x+2.2=3.7,
x+2.2-2.2=3.7-2.2,
x=1.5,
x÷
=1.5÷
,
x=3.5.
4x=40×2.5,
4x=100,
4x÷4=100÷4,
x=25;
(2)
| 1 |
| 4 |
0.4x=
| 1 |
| 4 |
0.4x=2,
0.4x÷0.4=2÷0.4,
x=5;
(3)
| 3 |
| 7 |
| 3 |
| 7 |
| 3 |
| 7 |
| 3 |
| 7 |
| 3 |
| 7 |
| 3 |
| 7 |
| 3 |
| 7 |
| 3 |
| 7 |
x=3.5.
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