3x+5(x+y)=36 3x+4(x+y)=36求最正确答案
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3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2
用递归法求y=x-(x*x*x/3!)+(x*x*x*x*x/5!)-(x*x*x*x*x*x*x/7!)+.
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
(x+y-5)*(x+y-5)+(x-y+3)=0 x*x-y*y
已知:3x-5y=0,求x/y,x-y/y,x-y/x
(5x+3y)(3y-5x)-(4x-y)(4y+x)=
4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5
xy²/(x²y-y) × x²/(x²+x)=(x²-3x)/(x²-5x) × 2x-10/(x²-6x+9)=化简求植x²-1/(x²-x-2)除以x/2x-4,其中x=1/2[x-x/(x+1)]除以[x/(2x-4)] ,其中x=√2+1
3x+3y+2x-2y=36 4x+4y-5x-5y=2
3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2 解方程组
3X=5Y (X+Y)*3X=(2Y+X)*4+2*2
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
(y-x)+x(x-y)^3-(y-x)^4 因式分解
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
高数求极限 y=[(3^x +4^x +5^x)/3]^(1/x) (x->0)
因式分解(x-2y)(x-3y)+(x-4y)(x-5y)+(x-3y)(x-5y)+(x-2y)(x-4y)