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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 8: Thực hiện phép tính a) 3x^3(2x^2 – 4x +2)

Tháng Sáu 19, 2022 Toán học 2 Comments 0 views

Toán Lớp 8: Thực hiện phép tính
a) 3x^3(2x^2 – 4x +2)

Comments ( 2 )

  1. tuminh25
    tuminh25
    19 Tháng Sáu, 2022 at 12:21 sáng
    Reply
    3x^3.(2x^2 – 4x +2)
    =(3x^3 . 2x^2)-(3x^3 . 4x)+(3x^3 . 2)
    =6x^5-12x^4+6x^3
     

  2. thuminhthong
    thuminhthong
    19 Tháng Sáu, 2022 at 12:20 sáng
    Reply
    $3x^3\left(2x^2-4x+2\right)$
    $=3x 
    ^3
     ×2x 
    ^2
     +3x 
    ^3
     ×−4x+3x 
    ^3
     ×2
    $
    $=(3×2)x ^3 x ^2 +3x ^3 ×−4x+3x ^3 ×2 $
    $=6x ^3 x ^2 +3x ^3 ×−4x+3x ^3 ×2 $
    $=6x ^3+2 +3x ^3 ×−4x+3x ^3 ×2 $
    $=6x ^5 +3x ^3 ×−4x+3x ^3 ×2 $
    $=6x ^5 +(3×−4)x ^3 x+3x ^3 ×2 $
    $=6x ^5 −12x ^3 x+3x ^3 ×2 $
    $=6x ^5 −12x ^3+1 +3x ^3 ×2 $
    $=6x ^5 −12x ^4 +3x ^3 ×2 $
    $=6x^5-12x^4+6x^3$

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222-9+11+12:2*14+14 = ? ( )

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