Ответ:2
Объяснение:(3-t)³+3r+21=-t²(t-9)
27-27t+9t²-t³+3r+21=-t³+9t²
48-24t=-t³+9r²-9t²+t³
24t=48
t=48/24=2
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Ответ:2
Объяснение:(3-t)³+3r+21=-t²(t-9)
27-27t+9t²-t³+3r+21=-t³+9t²
48-24t=-t³+9r²-9t²+t³
24t=48
t=48/24=2