3,7,17,41,99(?)A,239 B,238 C,237 D,236答案及原理?
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3,7,17,41,99(?)A,239B,238C,237D,236答案及原理?3,7,17,41,99(?)A,239B,238C,237D,236答案及原理?3,7,17,41,99(?)A,2
3,7,17,41,99(?)A,239 B,238 C,237 D,236答案及原理?
3,7,17,41,99(?)A,239 B,238 C,237 D,236答案及原理?
3,7,17,41,99(?)A,239 B,238 C,237 D,236答案及原理?
选A
17=7*2+3
41=17*2+7
99=41*2=17
a-2a+3a-4a+5a-6a+7a-8a+9a-10a+11a.+99a-100a=
3,7,17,41,99(?)A,239 B,238 C,237 D,236答案及原理?
-a-7a+3a
a-2a+3a-4a+5a-6a+...+99a-100a
（a+2)(a-2)(a二次方-a)+(2+a)(3-a)(a+3) （a+2)(a-2)(a二次方-7)+(2+a)(3-a)(a+3)
求a×(-a)²×a³×(-a)⁴×a^5×(-a)^6×a^7×…×a^99×(-a)^100
a=-1 求a-2a+3a-4a+5a-6a+...+99a-100a
化简3a×a×a+12a×a-6a-12 a=根号7-1
5(a*a*b-3*a*a*b)-2*(a*a*b-7*a*b*b)
a-3a+7a等于多少
-a+7a+3a=
[-a*(-2a)^3*(-a)^5]^7
7a+3a^2+2a-a^2+3
当a=99时,求(2a+3)(6a+2)-6a(2a+13)+8(7a+2)的值
3a平方-2a+4a平方-7a
化简a-2a+3a-4a+5a-6a…+99a-100a
化简 a-2a+3a-4a+5a'''''''+99a-100a a=-2 的值
当a=1时,a-2a+3a-4a+5a…+99a-100a=