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

Toán Lớp 8: 1. (x – 2) ² – 4(x – 3)(x + 2) 2. (3x – 1) ² + (x + 3)(2x – 1)

Tháng Tám 15, 2022 Toán học 2 Comments 0 views

Toán Lớp 8: 1. (x – 2) ² – 4(x – 3)(x + 2)
2. (3x – 1) ² + (x + 3)(2x – 1)

Comments ( 2 )

  1. doanthulan
    doanthulan
    15 Tháng Tám, 2022 at 4:14 chiều
    Reply
    Bạn kham khảo
    1)(x – 2)^2 – 4(x – 3)(x + 2)  
    =x^2-4x+2-(4x-12)(x+2)
    =x^2-4x+2-(4x^2+8x-12x-24)
    =x^2-4x+2-4x^2-8x+12x+24
    =-36x^2+26
    2)(3x-1)^2+(x-3)(2x-1)
    =9x^2-6x=1+2x^2-x+6x-3
    =11x^2-x-2

  2. hothaibinh
    hothaibinh
    15 Tháng Tám, 2022 at 4:13 chiều
    Reply
    1, (x-2)^2 – 4(x-3)(x+2)
    = x^2 – 4x +2 – (4x -12)(x+2)
    =x^2 – 4x +2 – (4x^2 + 8x – 12x – 24)
    = x^2 – 4x +2 – 4x^2 – 8x + 12x +24
    = -3x^2 +26
    2, (3x-1)^2 + (x+3)(2x-1)
    = 9x^2 – 6x +1 + 2x^2 – x + 6x -3
    = 11x^2 -x – 2
     

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

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