Помогите!!!
P.s *2 - это степень
1. a) (y+6)*2 б) (3a-b)*2 в) (9x-1)(8x+1) г) (14m+0.5n)(14m-0.5n)
2. a) (x-7)*2-(49+2x) б) (y+2)*2-(y-3)(y+3)
3. a) a*2-225 б) 16x*2-8xy+y*2 в) 9x*2 y*2-4a*4
4. 12-(4-x)*2=x(3-x)
5. а) (y*2-9a)(9a+y*2) б) (10x*2+x*2) в) (7+n)*2(7-n)*2
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