m+2d=mq^2 ……2
1 formula *2-2 formula omits m m≠0.
Yes: (q- 1) 2 = 0 ∴ q= 1 and if q= 1, the elements in the b set are not mutually exclusive.
So m+d = MQ 2.
m+2d=mq
Similarly, omitting d also has 2 * q 2-q- 1 = 0.
Q≠ 1, so q=- 1/2.
銆? 1 銆? Excuse me, are the Chinese and math textbooks for the second grade of Shijiazhuang Primary School in Hebei the same as those for t