Доведіть тотожність:
1) ( x² + y² - z² ) + ( x² + z² - y² ) - ( x² - z² ) = x² + z²
2) 2b² - ( 1 - 3b² ) - ( 5b² - 8 ) - ( b² + 4 ) - 1 = 2 - 2b²
3) ( - 2a³ + 3a² ) - ( 2a - 1 ) + ( 2a² - 5a ) - ( 3 - 2a³ - 7a ) = 5a - 2​
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