2a-b-3c+d=a-( )括号里应填 A -a-b-3c+d B -a-b+3c+d C -a+b+3c-d D -
5个回答
-a+b+3c-d
选C
相关问题
a,b,c,d>0 证(a/(b+2c+3d))+(b/(c+2d+3a))+(c/d+2a+3b))+(d/(a+2b
(a/(b+2c+3d))+(b/(c+2d+3a))+(c/d+2a+3b))+(d/(a+2b+3c))>=2/3
a+b+c+d=8,且a+2c=3b,b+2d=3c,c+2a=3d,d+2b=3a,求a+2b
已知a,b,c,d满足a≤b,c≤d,a+b=c+d≠0及a^3+b^3=c^3+d^3,求证:a=c,b=d.(要完整
已知a-b=3,c-d=2,求(a-b-c-d)[﹙b-a﹚+﹙b-a﹚﹙c-d﹚+﹙d-c﹚]
证明:(a^3+b^3+c^3)/(a+b+c)+(b^3+c^3+d^3)/(b+c+d)+(c^3+d^3+a^3)
解方程组:3a+b+c+d=0 a+3b+c+d=12 a+b+3c+d=12 a+b+c+3d=8
已知a/b=c/d,求证2a+3b/a+b=2c+3d/c+d
(A+B+C) ÷3+D=26 (A+B+D) ÷3+C=34 (A+C+D) ÷3+B=36 (D+B+C) ÷3+A
a/b=c/d=2/3,a+c/d+b=?