1. Упростите выражение
а) (х+1)²- (х-2)(х+4) б)(а+b)(a-b)(a²+b²)

2. Упростите выражение

(5/2x-4y- 1/2y-x): 3/x-2y

Помогите, пожалуйста! Срочно!
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