Упростите выражения:
1) (х – 2)(х – 11) – 2х(4 – 3х)
2) (а + 6)(а – 3) + (а – 4)(а + 5)
1) (х – 2)(х – 11) – 2х(4 – 3х)
2) (а + 6)(а – 3) + (а – 4)(а + 5)
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Answers & Comments
2)(а + 6)(а – 3) + (а – 4)(а + 5) = a²-3a+6a-18+a²+5a-4a-20=2a²+4a-38