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

Toán Lớp 8: Tìm x a) (x+3).(x-1)-x(x-5)=11 b) (8x+2).(1-3x)+(6x-1).(4x-10)=-50

Toán Lớp 8: Tìm x
a) (x+3).(x-1)-x(x-5)=11
b) (8x+2).(1-3x)+(6x-1).(4x-10)=-50

Comments ( 2 )

  1. Giải đáp + Lời giải và giải thích chi tiết:
    a, (x+3)(x-1)-x(x-5)=11
    => x^2 + 2x – 3 – x^2 + 5x = 11
    => (x^2-x^2) + (5x+2x) – 3 = 11
    => 7x – 3 =11
    => 7x = 14
    => x = 2
    Vậy S = {2}
    b, (8x+2)(1-3x)+(6x-1)(4x-10)=-50
    => -24x^2+2x+2+24x^2-64x+10=-50
    => (-24x^2+24x^2) – (64x-2x) + (10+2) = -50
    => -62x + 12 = -50
    => -62x = -62
    => x = 1
    Vậy S = {1} 

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