ДАЮ 30 БАЛЛОВ
Найдите значение выражений:
1)(3-x)²-x(x-21) при x=-2,84
2)d^7×(d³)^-1 при d=-2
3)a+ 2y-a²
¯¯¯¯¯¯¯ при a=-10 и y=19
a​
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