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

Toán Lớp 8: 1/ (2x+3).(x-1) 2/ (1-x).(x+2) 3/ (3x-7).(2-5x) 4/ (4x+1).(2x-3)

Toán Lớp 8: 1/ (2x+3).(x-1)
2/ (1-x).(x+2)
3/ (3x-7).(2-5x)
4/ (4x+1).(2x-3)

Comments ( 2 )

  1. Giải đáp và giải thích các bước giải:
    $1/ (2x + 3)(x – 1)$
    $= 2x^{2} – 2x + 3x – 3$
    $= 2x^{2} + x – 3$
    $2/ (1 – x)(x + 2)$
    $= x + 2 – x^{2} – 2x$
    $= -x^{2} – x + 2$
    $3/ (3x + 7)(2 – 5x)$
    $= 6x – 15x^{2} + 14 – 35x$
    $= -15x^{2} – 29x + 14$
    $4/ (4x + 1)(2x – 3)$
    $= 8x^{2} – 12x + 2x – 3$
    $= 8x^{2} – 10x – 3$

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

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