5.135. Докажите тождество: 1) (a - b)(a + b)(a²+b²)=a⁴-b⁴
2)(a⁴+b⁴)(a²+b²)(a+b)(a-b)=a⁸-b⁸
5.136. Разложите на множители:

1) 25x ^ 2 - (x + y) ^ 2

2) 100 - (3a + 7y) ^ 2
3)1-(a²+b²)²
4) m ^ 4 * n ^ 2 - (m - n) ^ 2
5)x⁴y²-(a²-b²)²
6) 9x ^ 2 * y ^ 4 - (a - b) ^ 2
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