2,3,6,9,17,( )A.33 B.27 C.45 D.19
2,3,6,9,17,( )A.33 B.27 C.45 D.19
2,3,6,9,17,( ) ..a:33 b:27 c:45 d:19..选那个?
已知:a、b、c、d都是自然数,a ^6=b ^4,c ^3=d ^2,a-c=19 求:b-d的值
2 ,3 ,6 ,9 ,17 ,( )A.18 B.23 C.36 D.45
a,b,c,d>0 证(a/(b+2c+3d))+(b/(c+2d+3a))+(c/d+2a+3b))+(d/(a+2b
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
3A-2B+9C+D=0 -6A-4B+D=0 2A-B+4C=0 这个方程组怎么解
A B C D × 9 ___________________ D C B A (1) A = ( )(2) B = (
用高斯消元法求解方程组的解:2A-B-C+D=2 ,A+B-2C+D=4 ,4A-6B+2C-2D=4 ,3A+6B-9
a+b+c+d=2a;a+b+c+d=4b;a+b+c+d=6c;a+b+c+d=8d 求a,b,c,d
1,2,4,3,5,6,9,18,( ) A.14 B.24 C.27 D.36
设a.b.c.d为正整数,a^7=b^6,c^3=d^2.已知c-a=17,求b-d=?