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

Toán Lớp 8: x*2-1= (2x+3)*3==–.

Toán Lớp 8: x*2-1=
(2x+3)*3=…………………

Comments ( 2 )

  1. x^2-1
    =x^2-1^2
    =(x-1)(x+1)
    (2x+3)^3
    =(2x)^3+3.(2x)^2 .3+3.2x.3^2+3^3
    =8x^3+36x^2+54x+27

  2. $x^2-1$
    $=x^2-1^2$
    $=\left(x+1\right)\left(x-1\right)$
    $———–$
    $\left(2x+3\right)^3$
    $=\left(2x\right)^3+3\left(2x\right)^2\cdot \:3+3\cdot \:2x\cdot \:3^2+3^3$
    $=8x^3+36x^2+54x+27$

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