AB是圆X^2+Y^2-6X+4Y-7=0的直径,若A=(1,2)求B的座标
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下列等式的右边是怎样从左边得到的?2x(x-y)^7/4y(y-x)^6=x(x-y)/2y
圆C:x^2+y^2-2x-4y=0被直线L:3x-y-6=0截得弦为AB求AB
因式分解、谁来教教我这些题啊?1、(1+2ab)²-(2+2ab)²2、(7x+y)(7x-y)-(-x+y)(x-y)3、(x-2y-1)(x+2y-1)4、(a-b-2c)²5、(x+2y-3/2)(x-2y+3/2)6、已知,2x-y=1/3,xy=2,求2x^4y³-x³y^4的值.
AB是圆X^2+Y^2-6X+4Y-7=0的直径,若A=(1,2)求B的座标
AB是圆x^2+y^@-6x+4y-7=0的直径.若A=(1,2),求B的坐标
把(x-y)看作一个整体,化解:5(x-y)+2(x-y)-4(x-y)= 3(x-y)把(x-y)看作一个整体,化解:5(x-y)+2(x-y)-4(x-y)=3(x-y)²-4(x-y)+7(x-y)-6(x-y)²=
{6(x-y)-7(x+y)=21 {2(x-y)-5(x+y)=-1
(x+y)/2- x-y/2=6 3(x+y)=4(x-y)
x+y/3+x-y/2=6 4(x+y)-2(x-y)=40
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20
{(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20
4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
4ab(2x-y)+b(2x-y) 因式分解
已知x的平方-xy-2y的平方-x-7y-6=(x-2y+a)(x+y+b),求ab的值
1.(a^2+ab+b^2)(a^2-ab+b^2)2.(7x-6y)^2+2(7x-6y)(7x+6y)+(7x+6y)^2化简求值1.(2x+y)(2x-y)+(x+y)^2-2(2x^2-xy)其中x=1,y=-1/42.已知x=6.61,y=-3.39.求(x-y)(x^2+3xy+y^2)-5xy*(x-y)的值