解比例: x:0.75=81:25
解比例:x:0.75=81:2523x:38=23:40.751.5=x64x+3=23....
解比例: x:0.75=81:25 23x:38=23:4 0.751.5=x6 4x+3=23.
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(1)x:0.75=81:25,
25x=0.75×81,
25x=60.75,
25x÷25=60.75÷25,
x=2.43;
(2)
x:
=
:4,
x×4=
×
,
x=
,
x÷
=
÷
,
x=
;
(3)
=
,
1.5x=0.75×6,
1.5x=4.5,
1.5x÷1.5=4.5÷1.5,
x=3;
(4)
=
,
2x+6-6=12-6,
2x=6,
2x÷2=6÷2,
x=3.
25x=0.75×81,
25x=60.75,
25x÷25=60.75÷25,
x=2.43;
(2)
2 |
3 |
3 |
8 |
2 |
3 |
2 |
3 |
3 |
8 |
2 |
3 |
8 |
3 |
1 |
4 |
8 |
3 |
8 |
3 |
1 |
4 |
8 |
3 |
x=
3 |
32 |
(3)
0.75 |
1.5 |
x |
6 |
1.5x=0.75×6,
1.5x=4.5,
1.5x÷1.5=4.5÷1.5,
x=3;
(4)
4 |
x+3 |
2 |
3 |
2x+6-6=12-6,
2x=6,
2x÷2=6÷2,
x=3.
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