x^2+y^2=(a^2+b^2)

通分a/(y-x)^2,b/(x-y)(x+y)通分a/(y-x)^2,b/(x-y)(x+y)通分a/(y-x)^2,b/(x-y)(x+y)通分a/(y-x)^2,b/(x-y)(x+y),公分母

因式分解a(x-y)+b(y-x)+(2x-y)因式分解a(x-y)+b(y-x)+(2x-y)因式分解a(x-y)+b(y-x)+(2x-y)你肯定你没打错?

(x+y)(a-2b)(x+y)(a-2b)(x+y)(a-2b)原式=x(a-2b)+y(a-2b)=ax-2bx+ay-2by

若集合A={(x,y)|y>=|x-2|},B={(x,y)|y若集合A={(x,y)|y>=|x-2|},B={(x,y)|y若集合A={(x,y)|y>=|x-2|},B={(x,y)|yA∩B在

A={（x,y)|y>=0.5|x-2|},B={(x,y)|yA={（x,y)|y>=0.5|x-2|},B={(x,y)|yA={（x,y)|y>=0.5|x-2|},B={(x,y)|y这个题目

已知a,b,X,Y属于R+,求证a^2/X+b^2/Y>=(a+b)^2/(X+Y)已知a,b,X,Y属于R+,求证a^2/X+b^2/Y>=(a+b)^2/(X+Y)已知a,b,X,Y属于R+,求证

已知：A=X*X-3xy+y*y,B=2x*x+xy-3y*3y.求A+B,A-B,A+2B已知：A=X*X-3xy+y*y,B=2x*x+xy-3y*3y.求A+B,A-B,A+2B已知：A=X*X

已知实数a,b,x,y,满足不等式（a+b）(x+y)>2(ay+bx),求证（x-y）/(a-b)+(a-b)/(x-y)>=2已知实数a,b,x,y,满足不等式（a+b）(x+y)>2(ay+bx

抛物线y=2-(x-a)(x-b)(a抛物线y=2-(x-a)(x-b)(a抛物线y=2-(x-a)(x-b)(am

初一因式分解练习题,谁好心帮我解下表示平方1.2X~-3XY-X2.(X+Y)~(X+Y)(X-Y)(X+Y)(Y+Z)3.3X(a+2b)~-6XY(a+2b)4.a(x-y)-b(X-Y)-C(Y

A={(X,Y)|X+Y>=1},B={(X,y)|X^2+y^2=1},B={(X,y)|X^2+y^2A={(X,Y)|X+Y>=1},B={(X,y)|X^2+y^2=1},B={(X,y)|X

填空：(b-a)(2x-y+1)=(a-b)()填空：(b-a)(2x-y+1)=(a-b)()填空：(b-a)(2x-y+1)=(a-b)()(b-a)(2x-y+1)=(a-b)[-(2x-y+1

A:{(x,y)|y=x方+2x},B:{(x,y)|y=x+a},A交B的真子集为空集,求a的范围A:{(x,y)|y=x方+2x},B:{(x,y)|y=x+a},A交B的真子集为空集,求a的范围

a(x-y)(x+y)-b(y-x)(x+y)-c(x-y)^2(y+x)提取公因式a(x-y)(x+y)-b(y-x)(x+y)-c(x-y)^2(y+x)提取公因式a(x-y)(x+y)-b(y-

已知x+y=a,x-y=b.求:x^2+y^2;xy已知x+y=a,x-y=b.求:x^2+y^2;xy已知x+y=a,x-y=b.求:x^2+y^2;xyx²+y²=[(x+y)

x+y=a,x-y=b.求2x-3y等于x+y=a,x-y=b.求2x-3y等于x+y=a,x-y=b.求2x-3y等于解方程组,得X=(a+b)/2,y=(a-b)/22x-3y=（5b-a)/2

4a(x-y)二次方-2b(y-x)二次方+(y-x)=4a(x-y)二次方-2b(y-x)二次方+(y-x)=4a(x-y)二次方-2b(y-x)二次方+(y-x)=4a(x-y)二次方-2b(y-

已知A=2x+y,B=2x-y,计算A^2-B^2已知A=2x+y,B=2x-y,计算A^2-B^2已知A=2x+y,B=2x-y,计算A^2-B^21、a^2-b^2=(a+b)(a-b)2、a=2

已知A=2x+y,B=2x-y,计算A^2-B^2已知A=2x+y,B=2x-y,计算A^2-B^2已知A=2x+y,B=2x-y,计算A^2-B^2∵A²-B²=(A+B)(A-

(a-b)(a^2+b^2)(a+b)[(x-y)^2-(x-y)(x+y)]/(2y)(a-b)(a^2+b^2)(a+b)[(x-y)^2-(x-y)(x+y)]/(2y)(a-b)(a^2+b^