5x-6=(-5)/6+7x,x/3=(1+y)/2
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
y=(x-1)(x-2)(x-3)(x-4)(x-5)(x-6)(x-7)(x-8)(x-9)(x-10)的导数在x=1
(1) x-3/x-2 - x-5/x-4=x-7/x-6 - x-9/x-8
(1)已知x+y=6,x²-y²=5,求x-y的值(2)若x+y=3,x²+y²
x+y=3 x+2y=9 3/x+1=y y-x=3 y=2x-3 y-3x=1 2(x+1)-y=6 7x-5y=-9
(1){x+2y=0,3x+4y=6(2){5x+6y=16,7x-9y=5(3){9x-11y+1=0,4x-5y-3
求函数Y=(X·X-2X-1)/(X·X-5X-6)的值域?
5x-6=(-5)/6+7x,x/3=(1+y)/2
解方程组 (1){2x-y=5,x-2y=1 (2){7x+3y=5,-5x+6y=-9
求函数y=\x-1\+\x-2\+\x-3\+\x-4\+\x-5\+\x-6\+.+\x-10\的最小值
化简 (x+y)(x²-xy+y²) ; 3(2x-1)(x+6)-5(x-3)(x+6)
(1)x+y=7 (2)3x+2y=-10 2x-5y=-21 2x+y=-6