а) (a+3) (b-7) =
б) (x-4) (x+8) =
в) (x-5) (9-x) =
г) (a+2) (a*2-a-3) =
д) (5b - 1) (b*2-5b+1) =
е) (3a+5)(3a - 6)+3a =
ж) 8x -(3x+1)(5x+1) =

а) xy(x+y)-(x*2-y*2)(x-2y)
б) (5с - 7р) (7а+5р) - (7с - 5р)(5с+7p)
в) (x*3+ 2y)(x*2-2y) - (x*2+2y)(x*3- 2y)


с решением
срочно плиз!
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