计算:(1)(5又根号3+2又根号5)^2 (2)(根号48+1/4又根号6)除以根号27
问题描述:
计算:(1)(5又根号3+2又根号5)^2 (2)(根号48+1/4又根号6)除以根号27
答
(1)(5又根号3+2又根号5)^2=(5√3)^2+2*5√3*2√5+(2√5)^2=75+20√15+20=95+20√15(2)(根号48+1/4又根号6)除以根号27=(√48/√27)+1/4(√6/√27)=√(48/27)+1/4√(6/27)=√(16/9)+1/4√(2/9)=4/3+(1/12)√2...