题目内容
解方程.
| (1+
| 0.26×3-0.9x=6% |
(1)
:
=x:48,
x=
×48,
x÷
=
×48÷
,
x=10;
(2)(1+
)x=6.25,
x=6.25,
x÷
=6.25÷
,
x=3.75;
(3)0.26×3-0.9x=6%,
0.78-0.9x=6%,
0.78-0.9x+0.9x=6%+0.9x,
0.78=6%+0.9x,
0.78-6%=6%+0.9x-6%,
0.72=0.9x,
0.72÷0.9=0.9x÷0.9,
x=0.8.
| 1 |
| 6 |
| 4 |
| 5 |
| 4 |
| 5 |
| 1 |
| 6 |
| 4 |
| 5 |
| 4 |
| 5 |
| 1 |
| 6 |
| 4 |
| 5 |
x=10;
(2)(1+
| 2 |
| 3 |
| 5 |
| 3 |
| 5 |
| 3 |
| 5 |
| 3 |
| 5 |
| 3 |
x=3.75;
(3)0.26×3-0.9x=6%,
0.78-0.9x=6%,
0.78-0.9x+0.9x=6%+0.9x,
0.78=6%+0.9x,
0.78-6%=6%+0.9x-6%,
0.72=0.9x,
0.72÷0.9=0.9x÷0.9,
x=0.8.
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