题目内容
解方程.
(1)
×6-30x=1.7
(2)
=
.
(1)
| 1 |
| 3 |
(2)
| 1.5 |
| x |
| 12.5 |
| 7.5 |
(1)
×6-30x=1.7,
2-30x=1.7,
2-30x+30x=1.7+30x,
2=1.7+30x,
2-1.7=1.7+30x-1.7,
0.3=30x,
0.3÷30=30x÷30,
x=0.01;
(2)
=
,
12.5x=1.5×7.5,
12.5x=11.25,
12.5x÷12.5=11.25÷12.5,
x≈0.9.
| 1 |
| 3 |
2-30x=1.7,
2-30x+30x=1.7+30x,
2=1.7+30x,
2-1.7=1.7+30x-1.7,
0.3=30x,
0.3÷30=30x÷30,
x=0.01;
(2)
| 1.5 |
| x |
| 12.6 |
| 7.5 |
12.5x=1.5×7.5,
12.5x=11.25,
12.5x÷12.5=11.25÷12.5,
x≈0.9.
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