23 89 43 2 ( )A.3 B.239 C.259 D.269
a,b,c,d>0 证(a/(b+2c+3d))+(b/(c+2d+3a))+(c/d+2a+3b))+(d/(a+2b
若a-b=2,b-c=-3,c-d=5,则(a-c)(b-d)÷(a-d)= ___ .
若a-b=-3,c+d=2,则(b+c)-(a-d)的值( ) a.-1 b.-5 c.5 d.1
若a-b=-3,c-d=2,则(b+c)-(a-d)的值( ) a.-1 b.-5 c.5 d.1
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
a*b=a+2b b*c=2b+3c c*d=3c+4d 那么(3*2)*(4*5)=?
已知a-b=3,c-d=2,求(a-b-c+d)【(b-a)平方+(b-a)(c-d)+(d-c)平方】的值
已知a-b=3,c+d=2,则(b+c)-(a-d)的值是( )
已知a-b=-3,c+d=2,则(b+c)-(a-d)的值为( )
(a+b+2c-3d)(a+b-2c+3d)用乘法公式计算.