(x-5)(X+4)=10 怎么算?
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(x-5)(X+4)=10 怎么算?
(x-5)(X+4)=10 怎么算?
(x-5)(X+4)=10 怎么算?
(x-5)(x+4)=10
x^2-x-20=10
x^2-x-30=0
(x-6)(x+5)=0
x=6或x=-5
x=6
(x-5)(x+4)=10
x^2-x-20=10
x^2-x-30=0
x(X+1)=30
x=-6或5