a.b满足lab-2l+l1-bl=0,求1/ab+1/(a+1)(b+2)++2)+.+1/(a+2008)(b+20
a.b满足lab-2l+l1-bl=0,求1/ab+1/(a+1)(b+2)++2)+.+1/(a+2008)(b+20
已知lab-2l+(a-1)的平方=0,求:1\ab+I\(a+1)(b+1)+1\(a+2)(b+2)+...+1\(
实数a,b满足ab不等于0,且使得a/(l+a)+b/(l+b)=(a+b)/(1+a+b),求a+b的值
设向量a,b满足lal=lbl=1,及l3a-2bl=根号7,求a,b夹角的大小,求l3a+bl的值
已知向量a,b满足lal=2,lbl=1,la-bl=2.求a*b的值.求la+bl的值
a,b满足根号a-1+根号b-2=0 求1/ab+1/(a+b)(b+1)+1/(a+2)(b+2)+.+1/(a+20
已知有理数a,b满足|a+b-2|+(a^2*b^2+2ab+1)=0,求代数式:(a-2b+3)(a-2b-3)-(b
2 2 2 2已知Ia+1l与l2a+bl互为相反数,试求整式3{a-b} -5{a-b} +3{a+b}+{a-b}
已知实数a,b满足:a^2+b^2=ab+a+b-1,求a+b之值
已知实数a,b满足ab=-1/5,a+b=4/5,求a^2b+ab^2-a^3b^2-a^2b^3
已知a、b满足a²+2b²-2ab-1=0,求a+2b的值
已知a,b满足a²+2b²-2ab-1=0,求a+2b的值