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

Toán Lớp 8: (2x+1)^2+(7-x)(7+x)-2(25+12x) Thực hiện phép tính

Toán Lớp 8: (2x+1)^2+(7-x)(7+x)-2(25+12x) Thực hiện phép tính

Comments ( 2 )

  1. $(2x+1)^2$+(7-x)(7+x)-2(25+12x)
    =4$x^{2}$+4x+1+49-$x^{2}$-50-24x
    =3$x^{2}$-20x
     

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