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

Toán Lớp 8: Rút gọn biểu thức a, (a-b^2)(a+b^2) b, ( a^2+2a+3)(a^2+2a-3)

Toán Lớp 8: Rút gọn biểu thức
a, (a-b^2)(a+b^2)
b, ( a^2+2a+3)(a^2+2a-3)

Comments ( 2 )

  1. a) (a-b^2)(a+b^2)
    =a^2-b^4
    b) (a^2+2a+3)(a^2+2a-3)
    =(a^2+2a)^2-9
    =a^4+4a^3+4a^2-9

  2. a) (a-b^2)(a+b^2)
    =a^2-b^4
    b) (a^2+2a+3)(a^2+2a-3)
    =(a^2+2a)^2-9
    =a^4+4a^3+4a^2-9

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

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