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

Toán Lớp 8: -2x(x-5)+2(x^2 – 4x)+2x+2021 Giúp mik với ạ

Toán Lớp 8: -2x(x-5)+2(x^2 – 4x)+2x+2021
Giúp mik với ạ

Comments ( 2 )

  1. #White
    -2x(x-5)+2(x^2-4x)+2x+2021
    = -(2x. x)+(2x. 5)+(2. x^2)-(2. 4x)+2x+2021
    = -2x^2+10x+2x^2-8x+2x+2021
    = (-2x^2+2x^2)+(10x-8x+2x)+2021
    = 4x+2021

  2. $\\$
    -2x(x-5)  +2 (x^2 – 4x)+2x+2021
    = -2x^2 + 10x + 2x^2 – 8x +2x+2021
    = (-2x^2 +2x^2)+(10x – 8x+2x)+2021
    = 4x + 2021
     

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

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