(3+X)(3-0.5X)=10
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(3+X)(3-0.5X)=10
(3+x)(3-0.5x)=10
9-1.5x+3x-0.5x^2=10
x^2-3x+2=0
(x-1)*(x-2)=0
x=1或x=2
9-1.5x+3x-0.5x^2=10
x^2-3x+2=0
(x-1)*(x-2)=0
x=1或x=2
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