Đáp án+Giải thích các bước giải:
$A=(2x-1)(3x²-7x+5)$
$=2x.3x^2+2x.(-7x)+2x.5+(-1).3x²+(-1).(-7x)+(-1).5$
$=6x^3−14x^2+10x−3x^2+7x−5$
$=6x³−17x²+17x−5$
`B=(y-1)(y²+y+1)+(1/3x²y-y)(2x+y²)`
`=y.y^2+y.y+y.1+(-1).y²+(-1).y+(-1).1+1/3x²y.2x+1/3x²y.y²+(-y).2x+(-y).y²`
`=y³+y²+y−y²−y-1+2/3x³y+1/3x²y³-2xy-y³`
`=-1+2/3x³y+1/3x²y³-2xy`
Chúc bn hc tốt🥰
$\text{#LinhSad}$