题目内容
x-
=
(x-4)÷2=7.5
7x+1.4x=20.16.
| 7 |
| 12 |
| 3 |
| 8 |
(x-4)÷2=7.5
7x+1.4x=20.16.
(1)x-
=
,
x-
+
=
+
,
x=
;
(2)(x-4)÷2=7.5,
(x-4)÷2×2=7.5×2,
x-4=15,
x-4+4=15+4,
x=19;
(3)7x+1.4x=20.16,
8.4x=20.16,
8.4x÷8.4=20.16÷8.4,
x=2.4.
| 7 |
| 12 |
| 3 |
| 8 |
x-
| 7 |
| 12 |
| 7 |
| 12 |
| 3 |
| 8 |
| 7 |
| 12 |
x=
| 23 |
| 24 |
(2)(x-4)÷2=7.5,
(x-4)÷2×2=7.5×2,
x-4=15,
x-4+4=15+4,
x=19;
(3)7x+1.4x=20.16,
8.4x=20.16,
8.4x÷8.4=20.16÷8.4,
x=2.4.
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