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anton2010000
@anton2010000
July 2022
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упростить выражение (5-3x)^2-4(2x-7) ; a(a+2b)-(a-b)^2
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sedinalana
Verified answer
1
25-30x+9x²-8x+28=9x²-38x+53
2
a²+2ab-a²+2ab-b²=4ab-b²
1 votes
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KarinaFelton
(5-3x)^2-4(2x-7) = 25-30x+9x^2-8x+28=9x^2-38x+53;
a(a+2b)-(a-b)^2 = a^2+2ab-(a^2-2ab+b^2)=a^2+2ab-a^2+2ab-b^2=4ab-b^2
1 votes
Thanks 0
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Answers & Comments
Verified answer
125-30x+9x²-8x+28=9x²-38x+53
2
a²+2ab-a²+2ab-b²=4ab-b²
a(a+2b)-(a-b)^2 = a^2+2ab-(a^2-2ab+b^2)=a^2+2ab-a^2+2ab-b^2=4ab-b^2