Toán Lớp 8: Bài 1: a)(2x+y²)³ b)(1/2x²+1/3y)³ c)(3x²-2y)³ d)(3/2x²-1/2y)³ e)(1/3x²-1/2)³ Bài 2: a)x⁸+x⁷+1 b)x⁵+x⁴+1 Giúp với hứa vote 5 sao và ctlh

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Toán Lớp 8:  Bài 1: a)(2x+y²)³ b)(1/2x²+1/3y)³ c)(3x²-2y)³ d)(3/2x²-1/2y)³ e)(1/3x²-1/2)³ Bài 2: a)x⁸+x⁷+1 b)x⁵+x⁴+1 Giúp với hứa vote 5 sao và ctlhn ạ

kimoanh34 · Answer

a ]     (2x+y&sup2;)&sup3;     = 8x&sup3; + 24x&sup2;y&sup2; + 6xy&sup2; + y^6     b ]       (1/2x^2 + 1/3y)^3 = 1/8x^6 + 1/27y^3 + 1/4x^4y + 1/6x^2y^2       c ]      (3x 2  - 2y) 3  = (3x 2 ) 3  - 3.(3x 2 ) 2 .2y +3.3x 2 .(2y) 2  -(2y) 3      = 27x 6  - 54x 4 y + 36x 2 y 2  - 8y 3      b&agrave;i 2      a]     x⁸ + x⁷ + 1 = x⁸ + x⁷ + x⁶ - x⁶ + 1 = (x⁸ + x⁷ + x⁶) - (x⁶ - 1) =     = x⁶(x&sup2; + x + 1) - ((x&sup3;)&sup2; - 1) = x⁶(x&sup2; + x + 1) - (x&sup3; - 1)(x&sup3; + 1) =     = x⁶(x&sup2; + x + 1) - (x - 1)(x&sup2; + x + 1)(x&sup3; + 1) = (x&sup2; + x + 1)(x⁶ - x⁴ + x&sup3; - x + 1)     b]            x5      +      x      4      +    1    =     (      x      5      +      x      4      +      x      3      )     &minus;     (      x      3      &minus;    1    )      x5+x4+1=(x5+x4+x3)&minus;(x3&minus;1)              =x      3       (      x      2      +    x    +    1    )     &minus;     (    x    &minus;    1    )      (      x      2      +    x    +    1    )      =x3(x2+x+1)&minus;(x&minus;1)(x2+x+1)             =(      x      2      +    x    +    1    )      (      x      3      &minus;    x    +    1    )

hoaiphuong85 · Answer

Xin gửi chủ  tus ạ Cho mk xin ctlhn cho nhóm nha bạn