y=0.5x^2 x^2+y^2=8 两条曲线围成的图形的面积两部分都要算 用定积分的应用
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x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
12y(x-y)^2-8(x-y)^3=?
化简(x^2-y^2)/(x+y)解法一:(x^2-y^2)/(x+y)=(x+y)(x-y)/(x+y)=x-y解法二:(x^2-y^2)/(x+y)=(x^2-y^2)(x-y)/(x+y)(x-y)=(x^2-y^2)(x-y)/(x^2-y^2)=x-y你认为小红同学的两种解法对吗?若解法错误,请说明原因
(x+2y)(x-2y)-(2y-x)(-2x-y)其中x=8,y=-8
(x+3y)²-2(x-y)(x+y)+(x+y)²其x=0.5,y=-2
[(x+2y)(x-2y)-(x-2y)^2+8y(x+y)]除以4x=
x*x+2x-y*y+6y-8=0,x+y不等于2,求x-y的值
已知X*X+Y*Y+6X-8Y+25=0 求(Y/X)+(X/Y)-2=?
填空:x-y/x+y=( )/x^2-y^2
(x-y)2•(y-x)³(x-y)=?
【2(x-y)(x-y)(x-y)-8(x-y)(x-y)(x+y)+6y(x-y)(x-y)]/2(x-y)(x-y)
两圆x^2+y^2-6x+16y=0与x^2+y^2+4x-8y-44=0的公切线条数
已知两圆x+y-2x+10y-24=0和x+y+2x+2y-8=0.求公共弦的长度
y+y'-2y=2x
微分方程y - 2y' + y = x
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
(x+y)(x-y)+(x-y)平方-(x-y)(3x-y) 其中x=-2 y=3分之一