80/x=2.5×80/(x+2.5)
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80/x=2.5×80/(x+2.5)
80/x=2.5×80/(x+2.5)
80/x=2.5×80/(x+2.5)
80/X=2.5x80/(X+2.5)
80X+80*2.5=80*2.5X
80(1.5X-2.5)=0
120X=200
X=5/3
80/x=2.5*80/(x+2.5)
120x=200
x=5/3
80/X=2.5x80/(X+2.5)
80X+80*2.5=80*2.5X
80(1.5X-2.5)=0
120X=200
X=5/3
80/x=2.5×80/(x+2.5)
3x=2.5X+80方程解3x=2.5x+80.
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