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

Toán Lớp 8: 1/ 5x^2z – 15xyz + 30 xz^2 (PTDTTNT) 2/ a^3 – 3a + 3b – b^3 3/ 25 – a^2 – 2ab – b^2 4/ 4x^2 – 25 + (2x+7)(5-2x) 5/ a^2x^2 – a^

Tháng Mười Hai 28, 2022 Toán học 1 Comment 0 views

Toán Lớp 8: 1/ 5x^2z – 15xyz + 30 xz^2 (PTDTTNT)
2/ a^3 – 3a + 3b – b^3
3/ 25 – a^2 – 2ab – b^2
4/ 4x^2 – 25 + (2x+7)(5-2x)
5/ a^2x^2 – a^2y^2 – b^2x^2 + b^2y^2

Comments ( 1 )

  1. diepbich93
    diepbich93
    28 Tháng Mười Hai, 2022 at 7:28 chiều
    Reply
    Giải đáp:
    1/5x^2z – 15xyz + 30 xz^2
    =5xz(x-3y+6z)
    2/ a^3 – 3a + 3b – b^3
    =(a^3– b^3)-(3a – 3b)
    =(a-b)(a^2+ab+b^2)-3(a-b)
    =(a-b)(a^2+ab+b^2-3)
    3/ 25 – a^2 – 2ab – b^2
    =5^2-(a+b)^2
    =(5-a-b)(5+a+b)
     

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

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