(3x+2)(2x-5)
=3x*(2x-5)+2*(2x-5)
=6x^-15x+4x-10
=6x^-11x-10
所以a=6,b=-11,c=-10
若需追问请便
若无请采纳!若(x+5)(x-7)=ax²+bx+c,则a= b= c=要过程哦！！(x+5)(x-7)=x（x-7)+5(x-7)=x^-7x+5x-35=x^-2x-35ax²+bx+c,则a=1 b=-2 c=-35no problem, just keep going最后记得采纳！