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

Toán Lớp 8: 16*/ 4x(x + 1)^2 – 5x^2 (x + 1) – 4(x+1) 17*/ (x + 2)( x + 3)( x + 4)( x + 5)-24 18*/ x^4 + 4

Home/ Toán Lớp 8: 16*/ 4x(x + 1)^2 – 5x^2 (x + 1) – 4(x+1) 17*/ (x + 2)( x + 3)( x + 4)( x + 5)-24 18*/ x^4 + 4

Toán Lớp 8: 16*/ 4x(x + 1)^2 – 5x^2 (x + 1) – 4(x+1) 17*/ (x + 2)( x + 3)( x + 4)( x + 5)-24 18*/ x^4 + 4

Tháng Sáu 2, 2022 Toán học 1 Comment 0 views

Toán Lớp 8: 16*/ 4x(x + 1)^2 – 5x^2 (x + 1) – 4(x+1)
17*/ (x + 2)( x + 3)( x + 4)( x + 5)-24
18*/ x^4 + 4

Comments ( 1 )

  1. thanoanghha
    thanoanghha
    2 Tháng Sáu, 2022 at 8:41 chiều
    Reply
    16)4x(x+1)^2-5x^2(x+1)-4(x+1)
    =(x+1)[4x(x+1)-5x^2-4]
    =(x+1)(4x^2+4x-5x^2-4)
    =(x+1)(-x^2+4x-4)
    =-(x+1)(x-2)^2
    17)(x+2)(x+3)(x+4)(x+5)-24
    =[(x+2)(x+5)][(x+3)(x+4)]
    =(x^2+5x+2x+10)(x^2+4x+3x+12)
    =(x^2+7x+10)(x^2+7x+12)
    18)x^4+4
    =x^4+4 + 4x^2- 4x^2
    =( x^2+2)^2 – 4x^2
    =( x^2+2-2x)( x^2 + 2+2x)

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

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