x^2-13x+12=-4x^2+18
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x^2-13x+12=-4x^2+18
![x^2-13x+12=-4x^2+18](/uploads/image/z/19549845-45-5.jpg?t=x%5E2-13x%2B12%3D-4x%5E2%2B18)
x^2-13x+12=-4x^2+18
5x^2-13x-6=0
(5x+2)(x-3)=0
x1=-2.5
x2=3
5x^2-13x-6=0
(5x+2)(x-3)=0
x1=-2.5
x2=3
已知 X=4- 根号3 求 (X*X*X*X-6X*X*X-2X*X+18X+23) / (X*X-8X+15)的值
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
若x=π/3,|x+1|+|x+3|+...+|x+13|-|x+2|-|x+4|-...-|x+12|
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
若x^2-8x+13=0求(x^4-6x^3-2x^2+18x+23)
解方程:(x^2+3x+1)/(4x^2+16x-1)-(12x^2+18x-3)/(x^2+3x+1)=2
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解方程:(1)x-0.75x=12(2)2.8x+x=7.6(3)2.36x+2.64x=18(4)3.5x-1.5x=
已知X=π/3,试求|X+1|-|X+2|+|X+3|-|X+4|.+|X+11|-|X+12|+|X+13|的值
已知x等于负三分之π,|x+1|-|x+2|+|x+3|-|x-4|+...+|x+11|-|x+12|+|x+13|=
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
x*x+2x+x*x+10x+x*x+25+2x+x*x+1+1+16+x*x+4x*x+9-12x+16x*x+4-1