X/(X+1000)=5%
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X/(X+1000)=5%
X/(X+1000)=5%
X/(X+1000)=5%
x/(x+1000)=5%
===> (x+1000)/x=20
===> x+1000=20x
===> 19x=1000
===> x=1000/19
X/(X+1000)=5%
X=0.05(X+1000)
X=0.05X+50
X-0.05X=50
0.95X=50
X=10000/19
交叉相乘,100X=5(X+1000),95X=5000,X=1000/19
X/(X+1000)=5%
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