(14+2/3)*(15+1/3)用平方差公式解
问题描述:
(14+2/3)*(15+1/3)用平方差公式解
答
(14+2/3)*(15+1/3)=(14+1-1+2/3)*(15+1/3)
=(15-1/3)*(15+1/3)=15^2-(1/3)^2=225-1/9