有因試分解的方法計算2.15^2-2*2.15*0.15+0.15^2

熱心網友

原式=(2.15^2-2.15*0.15)+(0.15^2-2.15*0.15) =2.15*(2.15-0.15)+0.15*(0.15-2.15) =2.15*2-0.15*2 =2*(2.15-0.15) =2*2 =最后1步我不會做了阿。。靠你自己了。。：D

熱心網友

2.15/2-2*2.15*0.15+0.15/2=2.15/2-8*(2.15/2)*(0.15/2)+0.15/2=2.15/2-4*(2.15/2)*(0.15/2)-4*(2.15/2)*(0.15/2)+0.15*/2=2.15/2*(1+0.3)-0.15/2*(2.3-1)=1.3*(2.15/2-0.15/2)=1.3*1=1.3

熱心網友

解:設a=2.15b=0.15所以2.15^2-2*2.15*0.15+0.15^2 = a^2 - 2ab +b^2 = (a-b)^2 = (2.15-0.15)^2 = 2^2 = 4

熱心網友

=(2.15-0.15)^2=4