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

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

Home/ Toán Lớp 8: tính x(2x-x) -2x(x-3) x(x-1)-x(x-2) x(x+2)-(x-1)(x+1)

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

Tháng Tám 27, 2022 Toán học 2 Comments 0 views

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

Comments ( 2 )

  1. dantam45
    dantam45
    27 Tháng Tám, 2022 at 5:08 chiều
    Reply
    #tnvt
    x(2x-x)
    =2x^2-x^2
    =x^2
    -2x(x-3)
    =-2x^2+6x
    x(x-1)-x(x-2)
    =x^2-x-x^2+2x
    =x
    x(x+2)-(x-1)(x+1)
    =x^2+2x-x^2+1
    =2x+1

  2. maianhnhiquynh
    maianhnhiquynh
    27 Tháng Tám, 2022 at 5:07 chiều
    Reply
    x(2x-x)=x.2x-x.x=2x²-x²=x²
    —
    -2x(x-3) = -2x.x -2x.(-3) = -2x²+6x
    —
    x(x-1) – x(x-2)
    =x.x-x.1 -x.x-x.(-2)
    =x²-x-x²+2x=x
    —
    x(x+2)-(x-1)(x+1)
    =x.x+x.2 – (x²-1²)
    =x²+2x-x²+1
    =2x+1
     

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

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