Тождественны ли выражения?

1)p³p и p⁴ 4)x+x²+x³+x⁴ и x⁵

2)a-c и c-a 5)-a² и (-a)²

3)a²+b² и (a+b)² 6)x-2a и -2a+x

7)a+c² и (a+c)²
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