痛苦,太乱了,不知道对不对。你还不如问同学呢14x^2+12x^3y+16x^4y^3/(-4x^2)=-7/2-3xy-4x^2y^316*10^17/0.2*10^7=8*10^8-4a^2b^2/3(3a^2/2+9ab/4-27b^2/8)=-2a^4b^2-3a^3b^3-9/2a^2b^4(x-2)(x-3)+2(x+6)(x-5)-3(x^2-7x+3)=x^2-5x+6+2x^2+2x-60-3x^2+21x-9=18x-63