题目内容
解方程.
(1)
=
(2)6×3-1.8x=7.2
(3)x:50=1.5:75.
(1)
| 10 |
| x |
| 2.5 |
| 0.8 |
(2)6×3-1.8x=7.2
(3)x:50=1.5:75.
(1)
=
,
2.5x=10×0.8,
2.5x÷2.5=8÷2.5,
x=3.2;
(2)6×3-1.8x=7.2,
18-1.8x=7.2,
18-1.8x+1.8x=7.2+1.8x,
18=7.2+1.8x,
18-7.2=7.2+1.8x-7.2,
10.8=1.8x,
10.8÷1.8=1.8x÷1.8,
x=6;
(3)x:50=1.5:75,
75x=50×1.5,
75x÷50=75÷75,
x=1.
| 10 |
| x |
| 2.5 |
| 0.8 |
2.5x=10×0.8,
2.5x÷2.5=8÷2.5,
x=3.2;
(2)6×3-1.8x=7.2,
18-1.8x=7.2,
18-1.8x+1.8x=7.2+1.8x,
18=7.2+1.8x,
18-7.2=7.2+1.8x-7.2,
10.8=1.8x,
10.8÷1.8=1.8x÷1.8,
x=6;
(3)x:50=1.5:75,
75x=50×1.5,
75x÷50=75÷75,
x=1.
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