X+Y=3,XY=1,a+b=5,ab=3,且m=ax+bx,n=bx+ay,求m3+n3的值为什么
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⒈2(Xy+Xy)-3(Xy-xy)-4Xy,其中X=1,y=-1 ⒉1/2ab-5⒈2(Xy+Xy)-3(Xy-xy)-4Xy,其中X=1,y=-1⒉1/2ab-5aC-(3ac b)+(3aC-4a C),其中a=-1,b=2,C=-2
先化简,再求值 ⒈2(Xy+Xy)-3(Xy-xy)-4Xy,其中X=1,y=-1先化简,再求值⒈2(Xy+Xy)-3(Xy-xy)-4Xy,其中X=1,y=-1⒉1/2ab-5aC-(3ac b)+(3aC-4a C),其中a=-1,b=2,C=-2
-4x^2y-8xy^2+2x^2y-3xy^2 合并同类项-4x^2y-8xy^2+2x^2y-3xy^2 3x^2-1-2x-5+3x-x^2 -0.8a^2b-6ab-1.2a^b+5ab+a^2b 5yx-3x^2y-7xy^2+6xy-12xy+7xy^2+8x^2y 合并同类项 求代数式1/2(a-b)^2+1/4(a+b)-1/3(a-b)^2-1/5(a+b)的值,其中a=-1 b=1/2. 如果x^
(-3xy)(2xy²-5xy-4y²)=?x^n(x^n+1-x^n+x^n+1+1)=?(只要答案)3xy(x²y-xy²+xy)-xy²(2x²-6xy+2x)=?先简化,在求值:-3a²(4/3ab²+b)-4b(a²-3/2a³b)+(ab)²(a-1),其中a=2,b=-3.[(3m-
已知a^x=ab,b^y=ab,求xy/x+y
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
1) 通分 (x+6)/(x^2-x) x/x^2+4x-12 1/x2)已知 a+3b=0 ab不等于0 求(a^2+2ab-b^2)/(2a^2+ab+b^2)的值3)已知(x-y)/xy=3 求(5x+xy-5y)/(x-xy-y)4)已知a b c 满足(a+b)/c=(a+c)/b=(b+c)/a=k 求k的值
3a+b/a平方-9b平方 - 2a-b/a平方+ab-6b平方 + a-b/5ab-a平方-6b平方 (xy-x平方)*xy/x-y[(x/y-y/x 除以(x+y)+x(1/y-1/x)]除以1+x/y 若10的2y次方=25,则10的负y次方等于多少?1/x平方-1 - 2/x+1 + 3/1 - x=0(方程) 3
│a-2│+(b+3)的平方=0,求3a的平方b-[2ab的平方-2(ab-1.5a的平方b)+ab]+3ab的平方还有一道:已知x+4y=-1,xy=5,求(6xy+7y)+[8x-(5xy-y+6x)]的值
1、已知x+y=-2,xy=3,求代数式2(x+xy)-[(xy-3y)-x]-(-xy)还有:2.若a^2-ab=10,ab-b^2=-5,则a^2-b^2=________,a^2-2ab+b^2=________.
若x-y=1,xy=5,则x²y-xy²=?已知a+b=3,a²b+ab²=1,则ab=?
3a-3b/10ab*25a^b3/a^-b^= x^-4y^/x^+2xy+y^/x+2y/2x^+2xy(3a-3b)/(10ab)*(25a^b3)/(a^-b^)= (x^-4y^)/(x^+2xy+y^)/(x+2y)/(2x^+2xy)=
已知A=5x²y-3xy²+4xy;B=7xy²-2xy+x²y,且x+y=2,x-y=0,化简求-1/2(A+B)-A.
①xy·( )=x²y-xy²+xy ②a(b-c)-b(c-a)+c(a-b)=( ) ③-2ab·(a²b+3ab²-1)=( ) 直接
1、若x^2+y^2=5,xy=3,求(x+y)^2 (x-y)^2 2、x^+y^=5,x+y=6,求xy 3、若x+y=6,xy=3,求x^2+y^2 (x-y)^21、若x^2+y^2=5,xy=3,求(x+y)^2 (x-y)^22、x^+y^=5,x+y=6,求xy3、若x+y=6,xy=3,求x^2+y^2 (x-y)^24、a+b=5,a-b=3,求ab
初二数学题:分式的乘方1.(a-b/ab)^2 * (b-a/-a)^3 ÷ 1/a^2-b^22.先化简,再求值:[-xy/(x-y)^2]^4 * (x^2-xy/x)^3 * x^4/y^10 ÷ (x/xy-y^2)^5,其中x=-2,y=4
已知A=5x^+2xy-4y^,B=-x^-4xy+y^,C=x^-xy+3y^其中xy满足|2x+1|+(y-4)^=0,就A-2B+C已知A=5x^+2xy-4y^,B=-x^-4xy+y^,C=x^-xy+3y^其中xy满足|2x+1|+(y-4)^=0,求A-2B+C-2B+C的值
(1)(x+y)^2-(x+y)^3(2)(x-y)-(x-y)^3(3)(x-y)^2-(y-x)^3(4)2(x-y)-3(y-x)^2(5)4ab(a=b)^2-6a^2b(a+b)(6)(x+y)^2(x-y)+(x+y)(x-y)^2(7)2a(a-3)^2-6a^2(3-a)+8a(a-3)(8)24xy^2z^2(x+y-z)-32xyz(z-x-y)^2+8xy(z-x-y)(9)(a-b)(b-a)^n(b-a)^2n-1 [两解)(10)2^2=3,2^b