题目内容
解方程
| 5.4x+2.6x=840 | 1.75x÷14=0.5. |
(1)
+
x=2,
+
x-
=2-
,
x=
,
x×9=
×9,
x=10;
(2)5.4x+2.6x=840,
(5.4+2.6)x=840,
8x=840,
8x÷8=840÷8,
x=105;
(3)1.75x÷14=0.5,
1.75x÷14×14=0.5×14,
1.75x=7,
1.75x÷1.75=7÷1.75,
x=4.
| 8 |
| 9 |
| 1 |
| 9 |
| 8 |
| 9 |
| 1 |
| 9 |
| 8 |
| 9 |
| 8 |
| 9 |
| 1 |
| 9 |
| 10 |
| 9 |
| 1 |
| 9 |
| 10 |
| 9 |
x=10;
(2)5.4x+2.6x=840,
(5.4+2.6)x=840,
8x=840,
8x÷8=840÷8,
x=105;
(3)1.75x÷14=0.5,
1.75x÷14×14=0.5×14,
1.75x=7,
1.75x÷1.75=7÷1.75,
x=4.
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