题目内容
解方程.
+
x=2
x:7.5=
-2x=
(1+30%)x=45.5.
| 8 |
| 9 |
| 1 |
| 9 |
x:7.5=
| 1 |
| 2 |
| 7 |
| 8 |
| 1 |
| 5 |
(1+30%)x=45.5.
(1)
+
x=2,
(
+
x)×9=2×9,
8+x=18,
8+x-8=18-8,
x=10;
(2)x:7.5=
,
x:7.5=1:2,
2x=7.5×1,
2x÷2=7.5÷2,
x=3.75;
(3)
-2x=
,
2x=
-
,
2x÷2=
÷2,
x=
;
(4)(1+30%)x=45.5,
1.3x=45.5,
1.3x÷1.3=45.5÷1.3,
x=35.
| 8 |
| 9 |
| 1 |
| 9 |
(
| 8 |
| 9 |
| 1 |
| 9 |
8+x=18,
8+x-8=18-8,
x=10;
(2)x:7.5=
| 1 |
| 2 |
x:7.5=1:2,
2x=7.5×1,
2x÷2=7.5÷2,
x=3.75;
(3)
| 7 |
| 8 |
| 1 |
| 5 |
2x=
| 7 |
| 8 |
| 1 |
| 5 |
2x÷2=
| 27 |
| 40 |
x=
| 27 |
| 80 |
(4)(1+30%)x=45.5,
1.3x=45.5,
1.3x÷1.3=45.5÷1.3,
x=35.
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