1.（a+2b).(a+2b)=2.(a-2b).(a+2b)=3.(2b+a).(a+2b)=4.(-a-2b).(a+2b)=5.(2b+a).(b+a)=6.(b+2a).(3a+2b)=7.((2a+3b)b)-(2a.3b)=

1.（a+2b).(a+2b)=2.(a-2b).(a+2b)=3.(2b+a).(a+2b)=4.(-a-2b).(a+2b)=5.(2b+a).(b+a)=6.(b+2a).(3a+2b)=7.((2a+3b)b)-(2a.3b)= 设a,b,c属于正数,利用排序不等式证明1.a^ab^b>a^bb^a(a不等于b)2.(a^2a)(b^2b)(c^2c)>=[a^(b+c)][b^(c+a)][c^(a+b)] -2a(a+b)+b(a+b) a-b分之a+2b+b-a分之b-a-b分之2a= a+2b/b-a+b/a-b-2a/b-a=? 化简a/b(a-b)-b/a(a-b)其中a=3 b=-2 a/b=2 ,(a*a-ab+b*b)/(a*a+b*b)= 若a/b=2 则a*a-ab+b*b/a*a+b*b等于? 如果a/b=2则a*a-ab+b*b/a*a+b*b求值 1.x(a-b)-y(b-a)+z(a-b)2.已知a+b=1,ab=-1/2,求a(a+b)(a-b)-a(a+b)^2 计算：(a/(a-b)=a^2/a^2-2ab+b^2)÷(a/(a+b)-a^2/a^2-b^2)1.[a/(a-b)=a^2/(a^2-2ab+b^2)]÷[a/(a+b)-a^2/(a^2-b^2)]2.(a-1)[1-(a+1)÷(a-1/a)]3.(-a^2b^3)^3/(ab)^8+b/a^2 几个高二不等式证明题目1.a,b,c属于R+,证abc>=(a+b-c)(a+c-b)(b+c-a)2.a,b,c属于R+,证a方/b+b方/c+c方/a>=a+b+c3.a,b,c属于R+,证2a/(b+c)+2b/(c+a)+2c/(a+b)>=3 1...a,b∈R+ a+2b=ab (1)求a*b的取值范围.（2）求a+b的取值范围 2...a,b∈R+ a≠b a*a*a-b*b*b=a*a-b*b 求a+b的取值范围. (3a+2b)*(2a+b)*(a+b)= 2a(a-4b)-b(a+2b)=? [(a+b)^2-(a+b)]/(a+b)= a-b分之a*(b分之b-a)2=? {1,a,b/a}={0,a^2,a+b}