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

Toán Lớp 7: cho các đa thức f(x)=3+3x-1+3x^4 g(x)=-x^3+x^2-x+2-x^4 tính f(x) + g(x) , f(x)-g(x)

Toán Lớp 7: cho các đa thức
f(x)=3+3x-1+3x^4
g(x)=-x^3+x^2-x+2-x^4
tính f(x) + g(x) , f(x)-g(x)

Comments ( 2 )

  1. ***Lời giải***
    f(x)=3+3x-1+3x^4
    =3x^4+3x+2
    g(x)=-x^3+x^2-x+2-x^4
    =-x^4-x^3+x^2-x+2
    f(x)+g(x)=3x^4+3x+2-x^4-x^3+x^2-x+2
    f(x)+g(x)=(3x^4-x^4)-x^3+x^2+(3x-x)+(2+2)
    f(x)+g(x)=2x^4-x^3+x^2+2x+4
    f(x)-g(x)=3x^4+3x+2-(-x^4-x^3+x^2-x+2)
    f(x)-g(x)=3x^4+3x+2+x^4+x^3-x^2+x-2
    f(x)-g(x)=(3x^4+x^4)+x^3-x^2+(3x+x)+(2-2)
    f(x)-g(x)=4x^4+x^3-x^2+4x

  2. @Bơ
    Giải đáp+Lời giải và giải thích chi tiết:
    f(x)+g(x)=(3+3x-1+3x^4)+(-x^3+x^2-x+2-x^4)
    f(x)+g(x)=3+3x-1+3x^4-x^3+x^2-x+2-x^4
    f(x)+g(x)=3x^4-x^4-x^3+x^2+3x-x+3+2-1
    f(x)+g(x)=2x^4-x^3+x^2+2x+4
    f(x)-g(x)=(3+3x-1+3x^4)-(-x^3+x^2-x+2-x^4)
    f(x)-g(x)=3+3x-1+3x^4+x^3-x^2+x-2+x^4
    f(x)-g(x)=3x^4+x^4+x^3-x^2+3x+x+3-1-2
    f(x)-g(x)=4x^4+x^3-x^2+4x

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