(x-5)(x-n)是X^2-3x+m因式分解的结果求M,N

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(x-5)(x-n)是X^2-3x+m因式分解的结果求M,N

(x-5)(x-n)是X^2-3x+m因式分解的结果求M,N
(x-5)(x-n)是X^2-3x+m因式分解的结果求M,N

(x-5)(x-n)是X^2-3x+m因式分解的结果求M,N
(x-5)(x-n)=x²-5x-nx+5n=x²-x(5+n)+5n=X²-3x+m
∴5+n=3 5n=m
∴n=-2 m=-10

(x-5)(x-n)=x^2-nx-5x+5n=x^2-(n+5)x+5n=X^2-3x+m
n+5=3 n=-2
5n=m=-10

m=-10
n=-2

x^2-(5+n)x+5n=X^2-3x+m
5+n=========3
5n========m
n=-2
m=-10