Đáp án+Giải thích các bước giải:
`a) -4x^5y³(-2x²y³+3xy²-x²)`
`=8x^7y^6-12x^6y^5+4x^7y³`
`b) 6x²(-3x²+2x)-4x³(5x+3)`
`=-18x^4+12x³-20x^4-12x³`
`=-38x^4`
`c) (3x-5)(5x+3)-(2x-3)(2x+3)`
`=15x²+9x-25x-15-(4x²-9)`
`=15x²+9x-25x-15-4x²+9`
`=11x²-16x-6`
`d) (2x+1)²-(3x-1)(3x+1)`
`=4x²+4x+1-(9x²-1)`
`=4x²+4x+1-9x²+1`
`=-5x²+4x+2`
`e) (3x-2)²-9(x-2)(x+2)`
`=9x²-12x+4-9(x²-4)`
`=9x²-12x+4-9.x²+(-9).(-4)`
`=9x²-12x+4-9x²+36`
`=-12x+40`
Chúc bn hc tốt🥰
$\text{#LinhSad}$
