解不等式:x(x-3)≥2x^2-(x+4)(x-5)

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解不等式:x(x-3)≥2x^2-(x+4)(x-5)解不等式:x(x-3)≥2x^2-(x+4)(x-5)解不等式:x(x-3)≥2x^2-(x+4)(x-5)x(x-3)≥2x^2-(x+4)(x

解不等式:x(x-3)≥2x^2-(x+4)(x-5)
解不等式:x(x-3)≥2x^2-(x+4)(x-5)

解不等式:x(x-3)≥2x^2-(x+4)(x-5)
x(x-3)≥2x^2-(x+4)(x-5)
x^2-3x≥2x^2-(x^2-x-20) (开括号)
x^2-3x≥2x^2-x^2+x+20 (开括号,括号外是 -号,括号内需正负转
换)
x^2-3x-2x^2+x^2-x≥20 (把相同项互相抵消,x^2-2x^2+x^2=0,-3x- x=-4x)
-4x≥20 (-4X转正,〉号需要变成

x小于等于-5

X<=-5