1.y=√x^2-4x+92.y=x+3/√-2x^2+12x-183.y=√x^2-16+(1/√x^2-4x+3)
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1.y=√x^2-4x+92.y=x+3/√-2x^2+12x-183.y=√x^2-16+(1/√x^2-4x+3)1.y=√x^2-4x+92.y=x+3/√-2x^2+12x-183.y=√x^
1.y=√x^2-4x+92.y=x+3/√-2x^2+12x-183.y=√x^2-16+(1/√x^2-4x+3)
1.y=√x^2-4x+9
2.y=x+3/√-2x^2+12x-18
3.y=√x^2-16+(1/√x^2-4x+3)
1.y=√x^2-4x+92.y=x+3/√-2x^2+12x-183.y=√x^2-16+(1/√x^2-4x+3)
1 (负无穷,正无穷)
2 x不为3
3 x>=4或x
R
X不等于6
负无穷大,-4 4,正无穷大
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
先化简 再求值 (2x-y)(y+x)-(x-2y)(2y+x)-(-3y+x)^2其(√x+1)+y^2+4=-4y
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
2(x+y)-3(x-y)=3 ,4(x+y)+3(x-y)=15
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
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
3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9
3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2
(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
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
已知2y-x=-3,求[4y(2x-y)-2x(2x-y)]/(2x-y
x+y+2(-x-y+1)=3(1-y-x)-4-(y+x-1),x+y=?
1.已知:x-2y=3,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]除4x 的值