
解比例.45:54=60:X 3:2.5=X:40 35:67...
解比例.45:54=60:X3:2.5=X:4035:67=X:544024=5X6.5:x=3.25:423:56=X:9....
解比例.45:54=60:X 3:2.5=X:40 35:67=X:54 4024=5X 6.5:x=3.25:4 23:56=X:9.
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(1)45:54=60:x,
45x=54×60,
45x÷45=3240÷45,
x=72;
(2)3:2.5=x:40,
2.5x=3×40,
2.5x÷2.5=120÷2.5,
x=48;
(3)
:
=x:
,
x=
×
,
x÷
=
÷
,
x=
;
(4)
=
,
40x=24×5,
40x÷40=120÷40,
x=3;
(5)6.5:x=3.25:4,
3.25x=6.5×4,
3.25x÷3.25=26÷3.25,
x=8;
(6)
:
=x:9,
x=
×9,
x÷
=6÷
,
x=7.2.
45x=54×60,
45x÷45=3240÷45,
x=72;
(2)3:2.5=x:40,
2.5x=3×40,
2.5x÷2.5=120÷2.5,
x=48;
(3)
3 |
5 |
6 |
7 |
5 |
4 |
6 |
7 |
3 |
5 |
5 |
4 |
6 |
7 |
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7 |
3 |
4 |
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7 |
x=
7 |
8 |
(4)
40 |
24 |
5 |
X |
40x=24×5,
40x÷40=120÷40,
x=3;
(5)6.5:x=3.25:4,
3.25x=6.5×4,
3.25x÷3.25=26÷3.25,
x=8;
(6)
2 |
3 |
5 |
6 |
5 |
6 |
2 |
3 |
5 |
6 |
5 |
6 |
5 |
6 |
x=7.2.
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