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

Toán Lớp 7: rút gọn:a/ (1+2x)^2 + 2(2x-1)(1+2x)+(2x-1)^2 b/ (x^2 – 1)(x-2) – (x^2 – 2x + 1)(x-2)

Tháng Chín 14, 2022 Toán học 2 Comments 0 views

Toán Lớp 7: rút gọn:a/ (1+2x)^2 + 2(2x-1)(1+2x)+(2x-1)^2
b/ (x^2 – 1)(x-2) – (x^2 – 2x + 1)(x-2)

Comments ( 2 )

  1. phuongthuydung
    phuongthuydung
    14 Tháng Chín, 2022 at 7:53 sáng
    Reply
    @Bao
    a. (1+2x)^2+2(2x-1)(1+2x)+(2x-1)^2
    =(1+2x+2x-1)^2
    =(4x)^2
    =16x^2
    b.(x^2-1)(x-2)-(x^2-2x+1)(x-2)
    =(x-2)(x^2-1-(x^2-2x+1))
    =(x-2)(x^2-2-x^2+2x-1)
    = (x-2)(2x-2)
    =(x-2).2.(x-1)

  2. tuyetnhungthu
    tuyetnhungthu
    14 Tháng Chín, 2022 at 7:52 sáng
    Reply
    a, (1+2x)^2 + 2(2x-1)(1+2x) + (2x-1)^2
    = [ (1+2x) + ( 2x-1) ]^2
    = ( 1+2x+2x-1)^2
    = (4x)^2 = 16x^2
    b, (x^2 -1)(x-2) – (x^2 -2x+1)(x-2)
    =(x-2)(x^2 -1 – x^2 + 2x -1)
    = (x-2)(2x-2)
    = 2(x-2)(x-1)

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

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