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1. (5-3x) × (5+3x)
2. (4+7b) во втором степини
3. ( 2-y) × ( 4+2y+y во втором степени)
1. (5-3x) × (5+3x)
2. (4+7b) во втором степини
3. ( 2-y) × ( 4+2y+y во втором степени)
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1) 5² - (3х)² = 25 - 9х²2) (4+7b) ²= 4² + 2·4·7в + 7²в² = 16 + 56в + 49в²
3) ( 2-y) × ( 4+2y+y²) = 2³ - у³