(a-2b)÷(a+2b)=4 [3(a-2b)÷4(a+2b)]+[3(a+2b)÷(a-2b)]最好能稍微讲讲为啥当(a-2b)÷(a+2b)=4时，求 [3(a-2b)÷4(a+2b)]+[3(a+2b)÷(a-2b)]的值

(a-b)^6*[-4(b-a)^3]*(b-a)^2÷(a-b)=求过程 (2/3a)-[2/(a+b)]{[(a+b)/3a]-a-b}÷[(a-b)/b] (2/3a)-[2/(a+b)]{[(a+b)/3a]-a-b}÷[(a-b)/a] 4(a-b)3•(a+b)2÷【2(a+b)(a-b)】2 化简a/b(a-b)-b/a(a-b)其中a=3 b=-2 2(a+b)-[4(a+b)-3(a+b)]一[5(a-b)+(a-b)]过程 【(a+b)³-2(a+b)²-4(a+b)】÷(a+b)=? (3/4)(a+b)(a-b)=2(a-b),题目条件是a,b不等, (a-b)^2*(b-a)^5+(b-a)^3*(a-b)^4=? (a^2+1)(-4a^2+1)+a^4-1 3a(a-b)(a+b)-6(b-a)^2a^2-9(a-b)^2= 3a(a-b)(a+b)-6(b-a)^2= 计算(a-b)^m(a-b)[2(b-a)]^3[(b-a)^5]^2÷(a-b)^m= (a-2b)(3a+4b)+(2a-4b)(2a-3b)=(a-2b)*( 若a-b=4,3a+2b=6,3a(a-b)+2b(a-b)=( ). 5(a*a*b-3*a*a*b)-2*(a*a*b-7*a*b*b) (a+2b)(a-2b)+(a-b)(a+b)-2(a-3b)(a-b) 先化简,再求值:[(3a+2b)(3a-2b)-(a+2b)(5a-2b)]÷4a,其中a=2,b=-3 先化简再求值[(3a+2b)(3a-2b)-(a+2b)(a-2b)]÷(4a),其中|a-2|+(b+3)^2=0 2a(a-4b)-b(a+2b)=?