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

Toán Lớp 8: tìm x, biết (2x – 1)^2 – (3x – 2)^2 = -5x^2 + 5

Tháng Tám 3, 2022 Toán học 1 Comment 0 views

Toán Lớp 8: tìm x, biết
(2x – 1)^2 – (3x – 2)^2 = -5x^2 + 5

Comments ( 1 )

  1. maitrucloan
    maitrucloan
    3 Tháng Tám, 2022 at 1:34 chiều
    Reply
    Giải đáp:
     $(2x-1)²-(3x-2)²= -5x²+5$
    $⇔ (2x-1-3x+2).(2x-1+3x-2)=-5x²+5$
    $⇔ (1-x).(5x-3)= -5x²+5$
    $⇔ (1-x).(5x-3)+5x²-5$
    $⇔ (1-x).(5x-3)-5x.(1-x)=0$
    $⇔ (1-x).(5x-3-5x)=0$
    $⇔(1-x).-3=0$
    $⇔ -3+3x=0$
    $⇔ 3x=3$
    $⇔ x=1$
    $vậy$ $x=1$
     

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

Thanh Hùng

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