25:320=x:56.怎么解?

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25:320=x:56.怎么解?
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25:320=x:56.怎么解?
25:320=x:56.怎么解?

25:320=x:56.怎么解?
25 X
------- = ------
320 56
25 X
----- = -------
40 7
5 X
--- = ----
8 7
X = 35 / 8

25*56=320x
1400=320x
x=35/16