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Atachka
@Atachka
July 2022
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Номер 2. Помогите, плиз. а) б) и в).
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MaxSandy
A) (3а^2 + 2b)*(2b - 3a^2) + 9a^4 = (2b + 3а^2)*(2b - 3a^2) + 9a^4 = (4b^2 - 9a^4) + 9a^4 = 4b^2 - 9a^4 + 9a^4 = 4b^2
4*b^2 = 4 * (-0,3)^2 = 4*0,09 = 0,36
б) (0,3(a^3)b - 4(a^2)(b^3)):((1/2)(a^2)b )= (a^2)b * (0,3a - 4b^2)/((1/2)(a^2)b) = 2*(0,3a - 4b^2)*(a^2)b/(a^2)b = 2*(0,3a - 4b^2) = 0,6a - 8b^2
0,6a - 8b^2 = 0,6*0,2 - 8*(-3)^2 = 0,12 - 8*9 = 0,12 - 72 = -71,88
в) 2a*(a^2 + b^2) - (b^2)*(2a^2 - b^2) - b^3 =
2a^3 + 2a*(b^2) - 2a*(b^2) + b^4 - b^3 = 2a^3 + b
2a^3 + b = 2 * (-2)^3 + 3 =2*(-8) + 3 = -16 + 3 = -13
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Answers & Comments
4*b^2 = 4 * (-0,3)^2 = 4*0,09 = 0,36
б) (0,3(a^3)b - 4(a^2)(b^3)):((1/2)(a^2)b )= (a^2)b * (0,3a - 4b^2)/((1/2)(a^2)b) = 2*(0,3a - 4b^2)*(a^2)b/(a^2)b = 2*(0,3a - 4b^2) = 0,6a - 8b^2
0,6a - 8b^2 = 0,6*0,2 - 8*(-3)^2 = 0,12 - 8*9 = 0,12 - 72 = -71,88
в) 2a*(a^2 + b^2) - (b^2)*(2a^2 - b^2) - b^3 =
2a^3 + 2a*(b^2) - 2a*(b^2) + b^4 - b^3 = 2a^3 + b
2a^3 + b = 2 * (-2)^3 + 3 =2*(-8) + 3 = -16 + 3 = -13