Вариант 1:
а) $у+4$$у-2$ = у^2 + 4у - 2у - 8 = у^2 + 2у - 8
б) $3x-5$$2x+9$ = 6x^2 + 27x - 10x - 45 = 6x^2 + 17x - 45
в) $m+1$$m^2-m+3$ = m^3 - m^2 + 3m + m^2 - m + 3 = m^3 + 2m + 3
г) $-c-3$$c+1$ = -c^2 - 3c + c + 3 = -c^2 - 2c + 3
д) $11a-4$$3-2a$ = 33 - 22a - 12a + 8a^2 = 8a^2 - 34a + 33
e) $x-t$$x^2+2xt-3t^2$ = x^3 + 2x^2t - 3xt^2 - tx^2 - 2t^2x + 3t^3 = x^3 - tx^2 + 2x^2t - 5xt^2 + 3t^3

Вариант 2:
а) $t-3$$t+5$ = t^2 + 5t - 3t - 15 = t^2 + 2t - 15
б) $4x-7$$3x-8$ = 12x^2 - 32x - 21x + 56 = 12x^2 - 53x + 56
в) $v-2$$vg+3v-4$ = v^2g + 3v^2 - 4v - 2vg - 6v + 8 = v^2g + 3v^2 - 2vg - 10v + 8
г) $p+7$$-n-4$ = -np - 4p + 7n + 28 = -np - 4p + 7n + 28
д) $13p-1$$13p+1$ = 169p^2 + 13p - 13p - 1 = 169p^2 - 1
e) $a+b$$a^2-ab+b^2$ = a^3 - a^2b + ab^2 + ab^2 - ab^2 + b^3 = a^3 + b^3