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

Toán Lớp 8: bài 1 tính : 2x(x+1)+(x+3)(1+2x)

Toán Lớp 8: bài 1 tính :
2x(x+1)+(x+3)(1+2x)

Comments ( 2 )

  1. Giải đáp:
    $=4x^2+9x+3$
    Lời giải và giải thích chi tiết:
    $2x\left(x+1\right)+\left(x+3\right)\left(1+2x\right)$
    $=2x^2+2x+\left(x+3\right)\left(1+2x\right)$
    $=2x^2+2x+2x^2+7x+3$
    $=2x^2+2x^2+2x+7x+3$
    $=4x^2+2x+7x+3$
    $=4x^2+9x+3$

  2. Answer
    2x . (x + 1) + (x + 3) . (1 + 2x)
    = 2x . x + 2x . 1 + x . (1 + 2x) + 3 . (1 + 2x)
    = 2x^2 + 2x + x + 2x^2 + 3 + 6x
    = (2x^2 + 2x^2) + (2x + x + 6x) + 3
    = 4x^2 + 9x + 3

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