5. Упростите выраження. 1) (a + 1)² + (a-1)" 3) (x + p) + (r-p) 5) (a + b) + (a - b) 2) (a-1)²-(a + 1)² 4) (x-y) - (x +y) 6) (a - b)²-(a + b)²​
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