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nikitkamalakhov2001
@nikitkamalakhov2001
September 2021
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Упростите:
А) (x+4)(x-5)+20
Б) 4b(b-2)-(b-5)во второй степени
B) (3x-4y)(3x+4y)
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iliailis69
Х^2-5х+4х-20+20=х^2-х(1пример) 2пр:4b(b-2)-(b-5)^2=4b^2-8b-(b^2-10b+25)=4b^2-8b-b^2+10b-25=3b^2+2b-25 3пр:=9х^2-16у^2-это формула разности квадратов
3 votes
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