выполните умножение:

а)(х во второй степени -2х+1)(х во второй степени +2х+1)

б)(2t-v+s )(t+2v-s)

в)(y во второй степени -3y-2)(y во второй степени +3y -2)

в)(a+2b+3c0(2a-b+2c) 

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