题目内容
解方程.
①(2.5+x)÷5=(8.5+x)÷6
②
+
=
③43x+22x=(25+40)×3
④12x+8x-200=1200
⑤
x+
x+200=1200.
①(2.5+x)÷5=(8.5+x)÷6
②
| x |
| 2 |
| x |
| 5 |
| 7 |
| 10 |
③43x+22x=(25+40)×3
④12x+8x-200=1200
⑤
| 3 |
| 5 |
| 2 |
| 5 |
(1)(2.5+x)÷5=(8.5+x)÷6,
0.5+
x=1
+
x,
0.5+
x-
x=1
+
x-
x,
0.5+
x-0.5=1
-0.5,
x×30=
×30,
x=27.5;
(2)
+
=
,
x=
,
x×
=
×
,
x=1;
(3)43x+22x=(25+40)×3,
65x=65×3,
65x÷65=65×3÷65,
x=3;
(4)12x+8x-200=1200,
20x-200=1200,
20x-200+200=1200+200,
20x÷20=1400÷20,
x=70;
(5)
x+
x+200=1200,
x+200=1200,
x+200-200=1200-200,
x=1000.
0.5+
| 1 |
| 5 |
| 5 |
| 12 |
| 1 |
| 6 |
0.5+
| 1 |
| 5 |
| 1 |
| 6 |
| 5 |
| 12 |
| 1 |
| 6 |
| 1 |
| 6 |
0.5+
| 1 |
| 30 |
| 5 |
| 12 |
| 1 |
| 30 |
| 11 |
| 12 |
x=27.5;
(2)
| x |
| 2 |
| x |
| 5 |
| 7 |
| 10 |
| 7 |
| 10 |
| 7 |
| 10 |
| 7 |
| 10 |
| 10 |
| 7 |
| 7 |
| 10 |
| 10 |
| 7 |
x=1;
(3)43x+22x=(25+40)×3,
65x=65×3,
65x÷65=65×3÷65,
x=3;
(4)12x+8x-200=1200,
20x-200=1200,
20x-200+200=1200+200,
20x÷20=1400÷20,
x=70;
(5)
| 3 |
| 5 |
| 2 |
| 5 |
x+200=1200,
x+200-200=1200-200,
x=1000.
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