(2y-1)(4y的平方 1)(2y 1)=?
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(1)x的平方-y的平方+4x+4y=(x+y)(x-y)+4(x+y)=(x+y)(x-y+4)(2)x的平方*y的平方+1-x的平方-y的平方=x²y²-x²+1-y
[(x的平方+y的平方)-(x-y)的平方+2y(x-y)]/4y=1(x²+y²-x²+2xy-y²+2xy-2y²)/4y=1(4xy-2y
求答项是什么?还有1/2y-x根号下x的平方的意思是½y-x√(x²)么?
1-(x-y)/(x+2y)÷(x²-y²)/(x+2y)²=1-(x-y)/(x+2y)×(x+2y)²/(x+y)(x-y)=1-(x+2y)/(x+y)=
((x+y)的平方-(x-y)的平方-2y(x-1/2y))/4y=(4xy-2xy+y^2)/4y=(2xy+y^2)/4y=(2x+y)/4=10/4=2.5
1/40再问:过程再答:我想让您再发一遍原式行吗?((x+y)的平方-(x-y)的平方-2y(x-1/2y))/4y里的“x-1/2y”是(x-1)/2y还是x-(1/2y)?再问:第二个再答:(x+
原式=4(因为方程是4倍关系)
解题思路:转化已知条件求出2x+2y的值,根据同底数幂的乘法、同底数幂的乘方运算法则计算可解。解题过程:
楼主是不是把题写错了呀,应该是(X+2)^2+/Y+1/=0吧因为(X+2)^2大于等于0/Y+1/大于等于0所以只有同时为0时,和才为0即X=-2Y=-1带入原式=4
4/x-15x²y再问:朋友,发一下过程再答:3x²y-(-3x)²×(2y)+x³y²/(x²x²y²/4)=3x
y的三次方-3y平方+y-2=y(y的平方-y-1)-2(y的平方-y-1)-4=-4
已知:[(x²+y²)-(x-y)²+2y(x-y)]/4y=1,求4x²-(4x-2)/y²[(x²+y²)-(x-y)&sup
化简求值,[(X²+Y²-(X-Y)²+2Y(X-Y)]÷4Y=1,求4x/(4X²-Y²)-1/(2X+Y)由[(X²+Y²-(
题目已知:{(x^2+y^2)-(x-y)^2+2y(x-y)}/4y={x^2+y^2-(x^2-2xy+y^2)+(2xy-2y^2)}/4y=(4xy-2y^2)/4y=x-0.5y=1,可以推
(4x-3y)²-16y²=(4x-3y+4y)(4x-3y-4y)=(4x+y)(4x-7y)x²+2x(y-z)+(z-y)²=x²+2x(y-z
解(-3x²y)(-4x²y²-5y³-6x+1)=(-3x²y)(-4x²y²)+(-3x²y)(-5y³)
(x-y)[(x+y)+x-y]+4y-2y^2=2x(x-y)+4y-2y^2=2[x^2-xy+2y-y^2]所以=2[1-2+4-4]/8=-1/4
1.(2x-3y)^2-(y+3x)(3x-y)=4x^2-12xy+9y^2-(3x+y)(3x-y)=4x^2-12xy+9y^2-9x^2+y^2=10y^2-5x^2-12xy2.[(x-y)
x-y分之2x的平方-y-x分之x的平方-4xy+x-y分之2y的平方-x的平方=2x/(x-y)-(x²-4xy)/(y-x)+(2y-x²)/(x-y)=(2x+x²
{(x2+y2)-(x-y)2+2y(x-y)}/4y=1{x2+y2-(x2+y2-2xy)+2xy-2y2}/4y=1(4xy-2y2)/4y=1得:2x-y=24x/(4x2-y2)-1/(2x