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

Toán Lớp 12: a 1/3×3 +2×2+x-3 b x+1/2x-1/2 Giúp mình với ạ

Toán Lớp 12: a 1/3×3 +2×2+x-3
b x+1/2x-1/2
Giúp mình với ạ

Comments ( 1 )

  1. a.
    (1/3x^3 +2x^2+x-3)^’
    = 1/3 (x^3)^’ + 2(x^2)^’+x^’ -3^’
    =1/3*3x^2+2*2x+1-0
    =1 + 4 x + x^2
    b.
    (x+1/(2x)-1/2)^’  
    =x^’+1/2(1/x)^’-(1/2)^’
    =1+1/2*(-1/x^2)-0
    =1-1/(2 x^2)

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