Упростите:
2a(a+b+c)-2b(a-b-c)
2a^2+2ab+2ac-2ba+2b^2+2bc=2a^2+2b^2+2ac+2bc=2(a^2+b^2)+2c(a+b)
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2a^2+2ab+2ac-2ba+2b^2+2bc=2a^2+2b^2+2ac+2bc=2(a^2+b^2)+2c(a+b)