Question

求几道数学题,大侠们帮帮忙16题可以不做

Answer 1

9.原式=9x² - (y² + 4y + 4)=9x² - (y+2)²=(3x+y+2)(3x-y-2)10.(x+y²)(x-y²)(x²+y^4)=(x²-y^4)(x²+y^4)=x^4 - y^8m=4 ,n=811.112.2xy=(x+y)²-(x²+y²)=...