3a+b=11 3d+b=11 3b+a=9 a+2b+d=8 a+2c+b=21 a+2b+d=8 b+2d+a=7

3a+b=11 3d+b=11 3b+a=9 a+2b+d=8 a+2c+b=21 a+2b+d=8 b+2d+a=7 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 A B C D × 9 ___________________ D C B A (1) A = ( )(2) B = ( (a/(b+2c+3d))+(b/(c+2d+3a))+(c/d+2a+3b))+(d/(a+2b+3c))>=2/3 已知a/b=c/d,求证a+2b/b=c+2d/d a+b+c+d=2a;a+b+c+d=4b;a+b+c+d=6c;a+b+c+d=8d 求a,b,c,d 已知a-b=-5,b-c=3,求(b-2d+c)-(a-2d+b) int a=2,b=3; printf(a>b?”***a=%d”:”###b=%d”,a,b); 求结果, 若a-b=-3,c+d=2,求(b+c)-(a-d)的值 已知a-b=3,c +d=2,(b+c )-(a-d)的值为? a b c d* d_________=d c b a