题目内容
解方程.
(1)ⅹ-
ⅹ=
;
(2)20%ⅹ+15%ⅹ=
;
(3)
:ⅹ=
.
(1)ⅹ-
| 1 |
| 3 |
| 4 |
| 5 |
(2)20%ⅹ+15%ⅹ=
| 14 |
| 15 |
(3)
| 2 |
| 3 |
| 3 |
| 4 |
分析:(1)先整理化简,两边再除以
即可;
(2)先整理化简,两边再除以0.35即可;
(3)利用比的后项=比的前项÷比值即可.
| 2 |
| 3 |
(2)先整理化简,两边再除以0.35即可;
(3)利用比的后项=比的前项÷比值即可.
解答:解:(1)ⅹ-
ⅹ=
ⅹ=
ⅹ÷
=
÷
ⅹ=
;
(2)20%ⅹ+15%ⅹ=
0.35x=
0.35x÷0.35=
÷0.35
x=
;
(3)
:ⅹ=
x=
÷
x=
.
| 1 |
| 3 |
| 4 |
| 5 |
| 2 |
| 3 |
| 4 |
| 5 |
| 2 |
| 3 |
| 2 |
| 3 |
| 4 |
| 5 |
| 2 |
| 3 |
ⅹ=
| 6 |
| 5 |
(2)20%ⅹ+15%ⅹ=
| 14 |
| 15 |
0.35x=
| 14 |
| 15 |
0.35x÷0.35=
| 14 |
| 15 |
x=
| 8 |
| 3 |
(3)
| 2 |
| 3 |
| 3 |
| 4 |
x=
| 2 |
| 3 |
| 3 |
| 4 |
x=
| 8 |
| 9 |
点评:此题主要利用等式的性质解方程,注意方程的整理与化简.
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