题目内容
解比例或方程:
①
=
②12÷(0.5x-1)=6.
①
| x |
| 3.5 |
| x-16 |
| 1.5 |
②12÷(0.5x-1)=6.
(1)
=
,
3.5×(x-16)=1.5x,
3.5x-56=1.5x,
3.5x-56-1.5x=1.5x-1.5x,
2x-56+56=56,
2x÷2=56÷2,
x=28;
(2)12÷(0.5x-1)=6,
12÷(0.5x-1)×(0.5x-1)=6×(0.5x-1),
12=3x-6,
12+6=3x-6+6,
18÷3=3x÷3,
x=6.
| x |
| 3.5 |
| x-16 |
| 1.5 |
3.5×(x-16)=1.5x,
3.5x-56=1.5x,
3.5x-56-1.5x=1.5x-1.5x,
2x-56+56=56,
2x÷2=56÷2,
x=28;
(2)12÷(0.5x-1)=6,
12÷(0.5x-1)×(0.5x-1)=6×(0.5x-1),
12=3x-6,
12+6=3x-6+6,
18÷3=3x÷3,
x=6.
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