1)100-(16+28)=56(\%)-картофель
2)250:100•56=140(т)-всего привезли картофеля в магазин
Ответ:140 тонн.
2х+8-12=x^2-7x
2x+7x-x^2=4
x^2+9x=4
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X⁶+y⁶=(x²+y²)(x⁴-x²y²+y⁴)