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

Toán Lớp 8: $(x-1)(2x+1)+3(x-1)(x+2)(2x+1)$ Cần giúp gấp ạ

Toán Lớp 8: $(x-1)(2x+1)+3(x-1)(x+2)(2x+1)$
Cần giúp gấp ạ

Comments ( 2 )

  1. ***Lời giải***
    (x-1)(2x+1)+3(x-1)(x+2)(2x+1)
    =(x-1)(2x+1)[1+3(x+2)]
    =(x-1)(2x+1)(1+3x+6)
    =(x-1)(2x+1)(3x+7)

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