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

Toán Lớp 8: thực hiện phép tính (3-x)(3+x)+(x-5)^2

Toán Lớp 8: thực hiện phép tính (3-x)(3+x)+(x-5)^2

Comments ( 2 )

  1. Giải đáp: 
    ${(3-x)(3+x)+(x-5)}$
    ${=9-x^2+(x-5)^2}$
    ${=9-x^2+x^2-10x+25}$
    ${=9-10x+25}$
    ${=34-10x}$

  2. (3-x)(3+x)+(x-5)^2
    =3^2-x^2+(x^2-2.x.5+5^2)
    =9-x^2+x^2-10x+25
    =(x^2-x^2)-10x+(25+9)
    =-10x+34

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