(5-3t)(5+3t)=5^2-15t+15t+9t=25-30t+9t^2
меняем порядок
9t^2-30t+25
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(5-3t)(5+3t)=5^2-15t+15t+9t=25-30t+9t^2
меняем порядок
9t^2-30t+25