5000(1-x)²=7200

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5000(1-x)²=72005000(1-x)²=72005000(1-x)²=7200(1-x)^2=1.44,1-x=1.2或-1.2,x=-0.2或2.25000

5000(1-x)²=7200
5000(1-x)²=7200

5000(1-x)²=7200
(1-x)^2=1.44,1-x=1.2或-1.2,x=-0.2或2.2

5000(1+x)²=7200
(1+x)²=1.44
1+x=±1.2
x1=0.2 x2=-2.2

-0.2