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

Toán Lớp 8: Tìm x a) 5 (2x – 1) – 4 (8 – 3x) = -5 b) ( x + 1) (x + 2) – (x – 3) (x + 4) = 6

Tháng Sáu 1, 2022 Toán học 2 Comments 0 views

Toán Lớp 8: Tìm x
a) 5 (2x – 1) – 4 (8 – 3x) = -5
b) ( x + 1) (x + 2) – (x – 3) (x + 4) = 6

Comments ( 2 )

  1. myngocla
    myngocla
    1 Tháng Sáu, 2022 at 9:35 sáng
    Reply
    a, 10x-5-32+12x+5=0
        22x-32=0
        x=16/11
    b, x^2+3x+2-x^2-x+12-6=0
    2x+8=0
    x=-4
     
     

  2. hatuanlan
    hatuanlan
    1 Tháng Sáu, 2022 at 9:35 sáng
    Reply
    a) 5(2x-1)-4(8-3x)=-5
    ⇔10x-5-32+12x=-5
    ⇔22x=-5+32+5
    ⇔22x=32
    ⇔x=(16)/(11)
    Vậy x=(16)/(11)
    b) (x+1)(x+2)-(x-3)(x+4)=6
    ⇔x^2+2x+x+2-x^2-4x+3x+12=6
    ⇔2x=6-12-2
    ⇔2x=-8
    ⇔x=-4
    Vậy x=-4

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

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