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

Toán Lớp 8: 8) x ( x^2 – 1) – ( x – 1)( x^2 + x + 1) = -1/2 9) ( 2x + 3)^2 – 4x ( x -2) = 0 10) 4 ( x – 1)^2 – ( 2x +3)^2 = 0

Home/ Toán Lớp 8: 8) x ( x^2 – 1) – ( x – 1)( x^2 + x + 1) = -1/2 9) ( 2x + 3)^2 – 4x ( x -2) = 0 10) 4 ( x – 1)^2 – ( 2x +3)^2 = 0

Toán Lớp 8: 8) x ( x^2 – 1) – ( x – 1)( x^2 + x + 1) = -1/2 9) ( 2x + 3)^2 – 4x ( x -2) = 0 10) 4 ( x – 1)^2 – ( 2x +3)^2 = 0

Tháng Chín 9, 2022 Toán học 2 Comments 0 views

Toán Lớp 8: 8) x ( x^2 – 1) – ( x – 1)( x^2 + x + 1) = -1/2
9) ( 2x + 3)^2 – 4x ( x -2) = 0
10) 4 ( x – 1)^2 – ( 2x +3)^2 = 0

Comments ( 2 )

  1. buianhtuan
    buianhtuan
    9 Tháng Chín, 2022 at 8:15 chiều
    Reply
    Lời giải và giải thích chi tiết:
    8, \ x(x^2-1)-(x-1)(x^2+x+1)=-1/2
    <=> x^3-x-(x^3-1)=-1/2
    <=> x^3-x-x^3+1=-1/2
    <=> -x=-3/2
    <=> x=3/2
    Vậy x=3/2.
    9, \ (2x+3)^2-4x(x-2)=0
    <=> 4x^2+12x+9-4x^2+8x=0
    <=> 20x=-9
    <=> x=-9/20
    Vậy x=-9/20.
    10, \ 4(x-1)^2-(2x+3)^2=0
    <=> [2(x-1)]^2-(2x+3)^2=0
    <=> [2(x-1)-(2x+3)][(2(x-1)+2x+3]=0
    <=> (2x-2-2x-3)(2x-2+2x+3)=0
    <=> (-5).(4x+1)=0
    <=> 4x+1=0
    <=> x=-1/4
    Vậy x=-1/4. 

  2. diepbich93
    diepbich93
    9 Tháng Chín, 2022 at 8:15 chiều
    Reply
    y10000
     

    toan-lop-8-8-2-1-1-2-1-1-2-9-2-3-2-4-2-0-10-4-1-2-2-3-2-0

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

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