\(a,5xyz-12x^2yz^2-17xy^3-21x^2yz^2-6xyz+M=0\)
\(\Rightarrow-xyz-33x^2yz^2-17xy^3+M=0\)
\(\Rightarrow M=xyz+33x^2yz^2+17xy^3\)
Vậy...
b, \(M-\left(6x^4y^3-7xyz^3+9xyz\right)=4x^4y^3-3xyz^3-5xyz\)
\(\Rightarrow M=4x^4y^3-3xyz^3-5xyz+6x^4y^3-7xyz^3+9xyz\)
\(\Rightarrow M=10x^4y^3-10xyz^3+4xyz\)
Vậy...
a) Ta có:
\(M=-xyz+12x^2yz^2+17xy^3+21x^2yz^2+6xyz\)
\(=xyz+33x^2yz^2+17xy^3\)
b) \(M=4x^4y^3-3xyz^3-5xyz+\left(6x^4y^3-7xyz^3+9xyz\right)\)
\(=4x^4y^3+6x^4y^3-3xyz^3-7xyz^3-5xyz+9xyz\)
\(=10x^4y^3-10xyz^3+4xyz\)
a, \(5xyz-12x^2yz^2-17xy^3-21x^2yz^2-6xyz+M=0\)
\(\Rightarrow M=-5xyz+12x^2yz^2+17xy^3+21x^2yz^2+6xyz\)
\(\Rightarrow M=\left(-5xyz+6xyz\right)+\left(12x^2yz^2+21x^2yz^2\right)+17xy^3\)
\(\Rightarrow M=xyz+33x^2yz^2+17xy^3\)
b, \(M-\left(6x^4y^3-7xyz^3+9xyz\right)=4x^4y^3-3xyz^3-5xyz\)
\(\Rightarrow M=4x^4y^3-3xyz^3-5xyz+\left(6x^4y^3-7xyz^3+9xyz\right)\)
\(\Rightarrow M=4x^4y^3-3xyz^3-5xyz+6x^4y^3-7xyz^3+9xyz\)
\(\Rightarrow M=\left(4x^4y^3+6x^4y^3\right)+\left(-3xyz^3-7xyz^3\right)+\left(-5xyz+9xyz\right)\)
\(\Rightarrow M=10x^4y^3-10xyz^3+4xyz\)
Chúc bạn học tốt!!!
