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

Toán Lớp 8: `4(x-1)(x+5)-(x+2)(x+5)-3(x-1)(x+2)`

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

Comments ( 1 )

  1. Giải đáp:
    =6x-24
    Lời giải và giải thích chi tiết:
    4(x-1)(x+5)-(x+2)(x+5)-3(x-1)(x+2)
    =4(x^2+5x-x-5)-(x^2+5x+2x+10)-3(x^2+2x-x-2)
    =4(x^2+4x-5)-(x^2+7x+10)-3(x^2+x-2)
    =4x^2+16x-20-x^2-7x-10-3x^2-3x+6
    =6x-24

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