Пошаговое объяснение:
90/(x+30)=90/x +48/60
90x-90x-2700=0.8x^2+24x
0.8x^2+24x-2700=0
8x^2+240x-27000=0
D=57600+864000
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Пошаговое объяснение:
90/(x+30)=90/x +48/60
90x-90x-2700=0.8x^2+24x
0.8x^2+24x-2700=0
8x^2+240x-27000=0
D=57600+864000