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

Toán Lớp 8: Bài 1: Rút gọn biểu thức a) A= (x-y) (x^2+xy+y^2) – (x+y) (x^2-xy+y^2) b) B= (a^2b^2-5a) (a^4b^4+5a^3b^2+25a^2)

Toán Lớp 8: Bài 1: Rút gọn biểu thức
a) A= (x-y) (x^2+xy+y^2) – (x+y) (x^2-xy+y^2)
b) B= (a^2b^2-5a) (a^4b^4+5a^3b^2+25a^2)

Comments ( 2 )

  1. #Sad
    a,
    A= (x-y)(x^2+xy+y^2)-(x+y)(x^2-xy+y^2)
    A= x^3-y^3-x^3-y^3
    A= -2y^3
    b,
    B= (a^2b^2-5a)(a^4b^4+5a^3b^2+25a^2)
    B= a^6b^6+5a^5b^4+25a^4b^2-5a^5b^4-25a^4b^2-125a^3
    B= (5a^5b^4-5a^5b^4)+(25a^4b^2-25a^4b^2)+a^6b^6-125a^3
    B= a^6b^6-125a^3
     

  2. a) A=(x-y)(x^2+xy+y^2)-(x+y)(x^2-xy+y^2)
    \qquad A=x^3-y^3-(x^3+y^3)
    \qquad A=x^3-y^3-x^3-y^3
    \qquad A=-2y^3
    b) B=(a^2b^2-5a)(a^4b^4+5a^3b^2+25a^2)
    \qquad B=(a^2b^2-5a)[(a^2b^2)^2+a^2b^2. 5a+(5a)^2]
    \qquad B=(a^2b^2)^3-(5a)^3
    \qquad B=a^6b^6-125a^3

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

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