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NikX7
@NikX7
August 2022
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(2a - 1)2 - (2a + 1)2
* 2 после скобок квадрат.
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inblu
Verified answer
2 votes
Thanks 1
nafanya2014
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(2a - 1)²- (2a + 1)²=[ формула a² - b²=(a - b)·(a + b)]=
=( (2a-1) - (2a+1) )·( (2a-1) + (2a+1) )= (2a-1-2a-1)(2a-1+2a+1)=-2·4a=-8a
1 votes
Thanks 1
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Verified answer
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(2a - 1)²- (2a + 1)²=[ формула a² - b²=(a - b)·(a + b)]==( (2a-1) - (2a+1) )·( (2a-1) + (2a+1) )= (2a-1-2a-1)(2a-1+2a+1)=-2·4a=-8a