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dasha1D2412
@dasha1D2412
August 2022
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упростите выражения: 1) a(a-2)-(a-1) (a+1)
2) (5a-2b) (5a+2b)-4b(3a-b)+6a(2b+1)
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Эксперт5
Verified answer
1) a(a-2)-(a-1)(a+1)=a²-2a-(a²-1)=a²-2a-a²+1=-2a+1
2) (5a-2b)(5a+2b)-4b(3a-b)+6a(2b+1)=
=(5a)²-(2b)²-12ab+4b²+12ab+6a=
=25a²-4b²+4b²+6a=25a²+6a
4 votes
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Answers & Comments
Verified answer
1) a(a-2)-(a-1)(a+1)=a²-2a-(a²-1)=a²-2a-a²+1=-2a+12) (5a-2b)(5a+2b)-4b(3a-b)+6a(2b+1)=
=(5a)²-(2b)²-12ab+4b²+12ab+6a=
=25a²-4b²+4b²+6a=25a²+6a