Bài 4:
`a,`\(\left(2x^3+3x^4-12x^2\right):x\)
\(=2x^2+3x^3-12x\)
`b,` \(\left(2x^3y^4z^2-x^2y^5z-3x^4y^4z^3\right):\frac13xy^3z\)
\(=6x^2yz-3xy^2-9x^3yz^2\)
Bài 5:
\(5x^3.M=25.x^6-30x^5+10x^3\)
\(M=\left(25x^6-30x^5+10x^3\right):5x^3\)
\(M=5x^3-6x^2+2\)
bài 4:
\(a.\left(2x^3+3x^4-12x^2\right):x\) (đkxđ: x khác 0)
\(=3x^3+2x^2-12x\)
\(b.\left(2x^3y^4z^2-x^2y^5z-3x^4y^4z^3\right):\frac13xy^3z\) (đkxđ: x,y,z khác 0)
\(=6x^2yz-3xy^2-9x^3yz^2\)
bài 5: đkxđ: x khác 0
\(5x^3\cdot M=25x^6-30x^5+10x^3\)
\(\Rightarrow M=\left(25x^6-30x^5+10x^3\right):5x^3\)
\(\Rightarrow M=5x^3-6x^2+2\)
