题目内容
解方程
| x-0.25x=3 | x+
| 3.6x÷2=2.16. |
(1)x-0.25x=3,
(1-0.25)x=3,
0.75x=3,
0.75x÷0.75=3÷0.75,
x=4;
(2)x+
x=21,
(1+
)x=21,
1.4x=21,
1.4x÷1.4=21÷1.4,
x=15;
(3)3.6x÷2=2.16,
3.6x÷2×2=2.16×2,
3.6x=4.32,
3.6x÷3.6=4.32÷3.6,
x=1.2.
(1-0.25)x=3,
0.75x=3,
0.75x÷0.75=3÷0.75,
x=4;
(2)x+
| 2 |
| 5 |
(1+
| 2 |
| 5 |
1.4x=21,
1.4x÷1.4=21÷1.4,
x=15;
(3)3.6x÷2=2.16,
3.6x÷2×2=2.16×2,
3.6x=4.32,
3.6x÷3.6=4.32÷3.6,
x=1.2.
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