题目内容
解方程或比例.
15x-x=28 x+
x=10 5:2.5=4:x.
15x-x=28 x+
1 |
4 |
(1)15x-x=28,
14x=28,
14x÷14=28÷14,
x=2;
(2)x+
x=10,
(1+
)x=10,
x=10,
x×
=10×
,
x=8;
(3)5:2.5=4:x,
5x=2.5×4,
5x=10,
5x÷5=10÷5,
x=2.
14x=28,
14x÷14=28÷14,
x=2;
(2)x+
1 |
4 |
(1+
1 |
4 |
5 |
4 |
5 |
4 |
4 |
5 |
4 |
5 |
x=8;
(3)5:2.5=4:x,
5x=2.5×4,
5x=10,
5x÷5=10÷5,
x=2.
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