(11d-4n)(11d+4n) = 11d-4n во 2 степени
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Sin22/5*cos22,5=1/2*sin45=1/2*√2/2=√2/4
Ответ Г
9×9^2+9=82×3<span>^x
9(81+1)=82*3^x
9=3^x
x=2
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