2c+3d=95 3c+2d=80 c+d=

2c+3d=95 3c+2d=80 c+d=( ) 2c+3d=95 3c+2d=80 c+d= 2c+3d=95,3c+2d=80,c+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 (a/(b+2c+3d))+(b/(c+2d+3a))+(c/d+2a+3b))+(d/(a+2b+3c))>=2/3 已知ab互为相反数,c与d互为倒数,x=4(a-2)-(a-3b),y=c²d+d²-(d/c+c- ( )-(c-d)=(a-c)-(-b+d) 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? 在C语言中 main() {int a=1,b=2,c=3; printf("%d,%d,%d,%d\n",a=b=c, 2c加3d等于95,3c加2d等于80,c加d等于几