3 2 3 7 18 ()推下一项,A 47 B 24 C 36 D 70
a,b,c,d>0 证(a/(b+2c+3d))+(b/(c+2d+3a))+(c/d+2a+3b))+(d/(a+2b
若a/b=c/d=5/7(2b-3d不等于0),则2a-3c/2b-3d等于多少?
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
18的因数中质数又()个 a.6 b.3 c.2 该选abc的那一项
(a/(b+2c+3d))+(b/(c+2d+3a))+(c/d+2a+3b))+(d/(a+2b+3c))>=2/3
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
a*b=a+2b b*c=2b+3c c*d=3c+4d 那么(3*2)*(4*5)=?
数字推理3,3,6,18,( )A.24 B.72 C.36 D.48
1,2,4,3,5,6,9,18,( ) A.14 B.24 C.27 D.36