2,12,36,81,().A.100 B.125 C.150 D.175
2,12,36,81,().A.100 B.125 C.150 D.175
2,12,36,80,( ) A.100 B.125 C.150 D.175
A×2=a B×4=b C×6=c D×12=d A+B+C+D=256 a+b+c+d=770 求A·B`C`D和a`
设a,b,c,d为正数,求证(a+c/a+b)+(b+d/b+c)+(c+a/c+d)+(d+b/d+a)≥4
a,b,c,d>0 证(a/(b+2c+3d))+(b/(c+2d+3a))+(c/d+2a+3b))+(d/(a+2b
36,18,12,6,4,( ),24,2.A.2 B.12 C.36 D.1
[a,b)×[c,d
a,b ,c ,d
已知a/b=c/d,求证a+2b/b=c+2d/d
3a-2b+c=0 12a+4b+c=0 -a+b-c+d=0 8a+4d+2c+d=0求a.b.c.d的值,
求行列式 |a+b+c+2d a b c,d b+c+d+2a b c,d a a+c+d+2b c,d a b a+b
若a-b=2,b-c=-3,c-d=5,则(a-c)(b-d)÷(a-d)= ___ .