133/57,119/51,91/39,49/21,( ),7/3 A.28/12 B.21/14 C.28/9 D.3
NO.one 133/57,119/51,91/39,49/21,(),7/3 A.28/12,B.21/14,C.28
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
1,8,9,4,( C ),1/6A 3 B 2 C 1 D 1/32.133/57,119/51,91/39,49/2
已知加密规则为:明文a,b,c,d对应密文a+2b,2b+c,2c+3d,4d.那么当收到密文为14,9,23,28时,
1.3,3,6,(),21,33,48 A.9 B.12 C.15 D.18
已知a、b、c、d满足方程组3a+b+c+d=1a+3b+c+d=9a+b+3c+d=9a+b+c+3d=5
a,b,c,d>0 证(a/(b+2c+3d))+(b/(c+2d+3a))+(c/d+2a+3b))+(d/(a+2b
A B C D 1 2 3 4 8 7 6 5 9 10 11 12 16 15 14 13 .问1100在A.B.C.
数学解方程,复杂啊-12=3a+2b+c ①0=-a+b-c+d②0=27a+9b+3c+d③1=a+b+c+d④帮忙解
A:3,5,8,19,20,27.B:3,6,11,17,21,31. C:5,7,12,16,28,32.D:22,2
1/3 3/9 2/3 13/21 ( )A.17/27 B.17/26 C.19/27 D.19/28答案是B为什么?
3,10,21,35,51,() A.59 B.66 C.68 D.72