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

Toán Lớp 8: Kết quả thu gọn biểu thức (2x+3)^2 – (4x+1) (x-2) là Giúp mình với

Toán Lớp 8: Kết quả thu gọn biểu thức (2x+3)^2 – (4x+1) (x-2) là
Giúp mình với

Comments ( 2 )

  1. ( 2x + 3 )^2 – ( 4x + 1 ) ( x – 2 )
    = ( 2x + 3 )^2 – (  4x^2 – 8x + x – 2 )
    =(  2x + 3 ) ( 2x + 3 ) – 4x^2 + 7x + 2
    = 4x^2 + 6x + 6x + 9 – 4x^2 + 7x + 2
    = 12x + 9 + 7x + 2
    = 19x + 11

  2. $\text{( 2x + 3 $)^{2}$ – ( 4x + 1 )( x – 2 )}$
    $\text{= 4$x^{2}$ + 12x + 9 – ( 4$x^{2}$ – 8x + x – 2 )}$
    $\text{= 4$x^{2}$ + 12x + 9 – ( 4$x^{2}$ – 7x – 2 )}$
    $\text{= 4$x^{2}$ + 12x + 9 – 4$x^{2}$ + 7x + 2}$
    $\text{= 12x + 9 + 7x + 2}$
    $\text{= 19x + 9 + 2}$
    $\text{= 19x + 11}$

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

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