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若化简关于x,y的整式x^3+2a(x^2+xy)-bx^2-xy+y^2,...

x³+2a(x²+xy)-bx²-xy+y² =x³+(2a-b)x²+(2a-1)xy+y² x³、y²系数均不等于0,此两项恒存在,又得到的是三次二项式,因此化简后,(2a-b)x²、(2a-1)xy两项不存在,系数=0 2a-b=0 2a-1=0 解得a=1/2...

①原式=3x2-6xy-3x2+2y+6xy+2y=4y;②-B+2A=-(2ab-3b2+4a2)+2(3a2+b2-5ab)=-2ab+3b2-4a2+6a2+2b2-10ab=2a2+5b2-12ab;当a=-12,b=2时,-B+2A=2×(?12)2+5×22-12×(-12)×2=12+20+12=3212.

联立方程组,解得 x=-a+2 y=2a+3 x,y符号相反,故 x=-a+2>0且y=2a+3

解: a=B-2A=(4x²-6xy+2y²-3x-y)-2*(2x²-3xy+y²-x+2y) =4x²-6xy+2y²-3x-y-4x²+6xy-2y²+2x-4y =-x-5y 因为/x-2a/+(y+3)²=0 所以 (y+3)²=0 解得y=-3 /x-2a/=0 /x-2(-x-5y)/=/x+2x+10y/=/3x+10y/...

解: a=B-2A=(4x²-6xy+2y²-3x-y)-2*(2x²-3xy+y²-x+2y) =4x²-6xy+2y²-3x-y-4x²+6xy-2y²+2x-4y =-x-5y 因为/x-2a/+(y+3)²=0 所以 (y+3)²=0 解得y=-3 /x-2a/=0 /x-2(-x-5y)/=/x+2x+10y/=/3x+10y/...

-(a²-2a-2)+2(a²-1) =-a²+2a+2+2a²-2 =a²+2a .2(x²-xy)-3(2/3x²-xy) =2x²-2xy-2x²+3xy =xy

您好: [-2(x-y)]^4*[-1/2(y-x)] =16(x-y)^4*1/2(x-y) =8(x-y)^5 -2a^2(1/2ab+b^2)-50*(a^2b-ab^2) =-a^3b-2a^2b^2-50a^2b+50ab^2 (2x^3y^2)*3yz^2+4x^4y^3z^2(-6x^5y^4) =2/3x^3y^4z^2-24x^0y^7z^2 如果本题有什么不明白可以追问,如果满意记...

1.(2a^2b)*(-1/2ab^2)^3 =2a²b*(-1/8a^3b^6) =-1/4a^5b^7 2.(1+m+n)(1+m-n) =(1+m)²-n² =1+2m+m²-n² 3.化简求值[(x+2y)^2-(x+y)(3x-y)-5y^2]/2,其中x=-2y=1/2 =(x²+4xy+4y²-3x²-2xy+y²-5y&#...

(4)2(a²b+ab²)-2(a²b-1)-2ab²-2,其中a=-2,b=2 =2a²b+2ab²-2a²b+2-2ab²-2 =0 3.3ab-4ab+8ab-7ab+ab=______. 4.7x-(5x-5y)-y=______. 5.23a3bc2-15ab2c+8abc-24a3bc2-8abc=______. 6.-7x2+6x+1...

(1)2a=4 再把A 点坐标带进去求b =根号3 x^2/4+y^2/3=1 (2)左焦点(-1,0)设K(x0,y0) F1K中点为(x,y) 2x=x0-1 2y=y0 再根据(x0,y0)在椭圆上列出关于(x,y)的式子

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