这个算式如何推导v=a/(1+y)+(a+b)/(1+y)^2+(a+2b)/(1+y)^3+……[a+(n-1)b]/
1.已知集合A={(x,y)|y=2x+1},B={(x,y)|y=x+3},a∈A,b∈B,求a
(3x-y)(3x+y)+y(x+y);(a+1/2b)(a-1/2b)-(3a-2b)(3a+2b)快点,
1、(a-b)(x-y)-(b-a)(x+y)
已知x+y=a+b x^3+y^3=a^3+b^3 求证x^2n+1+y^2n+1=a^2n+1+b^2n+1
集合A={y|y=log2x},B={y|y=(1/2)^x},则A∩B=?
(1) (a+2b/a-b)+(b/b-a)-(2a/a-b); (2) (y/x-y+z)+(2x+z/y-x-z)-
应是分解a^2(a-b)+(b-a)(x-y)^2-2(y-x)+1
(1).(x+y)(a+2b)
已知集合A={(x,y)|(y-3)/(x-2)=a+1}B={(x,y)|(a^2-1)x+(a-1)y=15},当a
switch(a*a+b*b); { case 3 :case 1 :y=a+b; break; case 0 :y=b
设集合A={X/X=2m+1},集合B={y/y=3n+1},n,m为整数,求A交B
已知集合A={x|x=3n-2,n∈Z}B={y|y=3k+1,k=Z},证明A=B