1.(а + 2)(а + 6) + (а - 3)(а - 4), при а = 7
2.Решить :(х - 2)(х - 3) - (х + 1)(х - 4) = 0
3. Найдите значение выражения:
1 - (- а + 4)(9 - а) - (а + 3)(а - 5), при а = - 10
СРОЧНО!
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