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(Распишите их) : 

1)(4х - 3у)(4х+3у)+ (3х +4у)(4у - 3х)

2)(х+2)² - (х-3)(х+3)

3)(7а - 5b)(7a + 5b) - (4a + 7b)² 

4)(у - 2)(у+3) - (у -1)² + (5 - у) (у +5) 

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