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matveevadasa0353
@matveevadasa0353
August 2022
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2) C2 - 49
3)0,04-а2
4)х2- 4 дробь 9
5)4х2-25
6)81с2-64d2
7)0.09x2-0,25y2
8)a2b4-c6d8
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Alice277353
2) с² -49= с² -7² = (с-7)(с+7)
3) 0,04 -а² = 0,2²- а² = (0,2-а)(0,2+а)
4) х² - 4/9= х² - (2/3)² = (х-2/3)(х+2/3)
5) 4х² -25= (2х)² - 5² = (2х-5)(2х+5)
6) 81с² - 64d² = (9c)² - (8d)² = (9c-8d)(9c+8d)
7) 0,09x² - 0,25y² = (0,3x)² - (0,5y)² = (0,3x-0,5y)(0,3x+0,5y)
8) a²b⁴- c⁶ d⁸= (ab²) ² - (c³d⁴) ² = (ab² - c³d⁴)(ab² + c³d⁴)
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Answers & Comments
3) 0,04 -а² = 0,2²- а² = (0,2-а)(0,2+а)
4) х² - 4/9= х² - (2/3)² = (х-2/3)(х+2/3)
5) 4х² -25= (2х)² - 5² = (2х-5)(2х+5)
6) 81с² - 64d² = (9c)² - (8d)² = (9c-8d)(9c+8d)
7) 0,09x² - 0,25y² = (0,3x)² - (0,5y)² = (0,3x-0,5y)(0,3x+0,5y)
8) a²b⁴- c⁶ d⁸= (ab²) ² - (c³d⁴) ² = (ab² - c³d⁴)(ab² + c³d⁴)