(1/2x方+xy-1.5y方)/(x方-y方)
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(1/2x方+xy-1.5y方)/(x方-y方)(1/2x方+xy-1.5y方)/(x方-y方)(1/2x方+xy-1.5y方)/(x方-y方)原式=(x²y²-4-2x²
(1/2x方+xy-1.5y方)/(x方-y方)
(1/2x方+xy-1.5y方)/(x方-y方)
(1/2x方+xy-1.5y方)/(x方-y方)
原式=(x²y²-4-2x²y²+4)÷xy
=-x²y²÷xy
=-xy
=-10×(-1/25)
=2/5
(1/2x方+xy-1.5y方)/(x方-y方)
因式分解 x方+y方-xy+2x-y+1
x方-xy+1/4y方
换元法分解因式（x方+y方）（x方-xy+y方）-2x方y方
化简-(x方-2xy-y方)+(5x方-2xy-3y方)
〔2x方y-2xy方〕-［〔-3x方y方+3x方y〕+〔3x方y方-3xy方〕］已知x=-1，y=2
计算 x方/x-y+y方/x-y-2x方y-2xy方/x方-2xy+y方 答案为x+y
x方+y方-x方y方-4xy-1因式分解
((3/2x方+xy-3/5y方)*(-4/3x方y方)
已知x方+2xy-y方=7,求x方+y方的最小值
(3/2x方+xy-3/5y方)*(-4/3x方y方)
X方-5XY+3Y方 实数范围内因式分解-2X方-3X+64X方Y方+XY-1
计算:（xy分之x+y）方-x方y方分之x方-y方
xy方-x方y方分之x方-1约分得?
x方y方-x方-y方+1因式分解
x方-xy+y方 等于?
化解的题xy+y方--------x方-y方
整式乘法公式已知X+Y=8,XY=12,求：（1）X方Y+XY方（2）X方-XY+Y方