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Алгебра 7 класс помогите
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gjmargosha
(2b+3)³= (2b+3)(2b+3)²=(2b+3)(4b²+12b+9)= 8b³+24b²+18b+12b²+36b+27=8b³+36b²+54b+27
(3a-2b)³=(3a-2b)(3a-2b)²=(3a-2b)(9a²-12ab+4b²) = 27a³-36ab+12ab²-18a²b+24ab²-8b³= 27a³-36ab+36ab²-18a²b-8b³
(3c-1)²=9с²-6c+1
(-a-b)³=(-a-b)(-a-b)²=(-a-b)(a²+2ab+b²)=-a³-2a²b-ab²-a²b-2ab²-b³=a³-3a²b-3ab²-b³
(2a+3b)³=(2a+3b)(2a+3b)²=(2a+3b)(4a²+12ab+9b²)= 8a³+24a²b+18ab²+12a²b+36ab²+27b³=8a³+36a²b+54ab²+27b³
(-2a+b)³=(-2a+b)(-2a+b)²=(-2a+b)(4a²-4ab+b²)= -8a³+8a²b-2ab²+4a²b-4ab²+b³=-8a³+12a²b -6ab²+b³
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Answers & Comments
(3a-2b)³=(3a-2b)(3a-2b)²=(3a-2b)(9a²-12ab+4b²) = 27a³-36ab+12ab²-18a²b+24ab²-8b³= 27a³-36ab+36ab²-18a²b-8b³
(3c-1)²=9с²-6c+1
(-a-b)³=(-a-b)(-a-b)²=(-a-b)(a²+2ab+b²)=-a³-2a²b-ab²-a²b-2ab²-b³=a³-3a²b-3ab²-b³
(2a+3b)³=(2a+3b)(2a+3b)²=(2a+3b)(4a²+12ab+9b²)= 8a³+24a²b+18ab²+12a²b+36ab²+27b³=8a³+36a²b+54ab²+27b³
(-2a+b)³=(-2a+b)(-2a+b)²=(-2a+b)(4a²-4ab+b²)= -8a³+8a²b-2ab²+4a²b-4ab²+b³=-8a³+12a²b -6ab²+b³