48,32,17,3,14,( ),43,59 A.28 B.33 C.31 D.27
5,16,17,28,32,43,48,( ) A.49 B.52 C.56 D.59 请说明理由
2,3,6,9,17,( ) ..a:33 b:27 c:45 d:19..选那个?
2,3,6,9,17,( )A.33 B.27 C.45 D.19
a,b,c,d>0 证(a/(b+2c+3d))+(b/(c+2d+3a))+(c/d+2a+3b))+(d/(a+2b
[a,b)×[c,d
a,b ,c ,d
a和B都是自然数,且11分之A加上3分之B等于33分之17,那么A+B=() A.14 B.3 C.20 D.28 为什
设a.b.c.d为正整数,a^7=b^6,c^3=d^2.已知c-a=17,求b-d=?
已知:a/b=c/d,求证:(2a+3b)/(a+b)=(2c+3d)/(c+d)
已知a/b=c/d,求证2a+3b/a+b=2c+3d/c+d
( )-(c-d)=(a-c)-(-b+d)
A+B+C+D=120; 2B+3C+5D=220;2A-C-3D=20;5A+3B+2C=380;3A+B-2D=14