√18除以√8=? √0.4乘以√3.6=? √3分之2乘以√8分之27=? √2除以3√40=? 包过程请高手解答

√18除以√8=√(18÷8)=√(9/4)=3/2√0.4乘以√3.6=√(0.4×3.6)=√1.44=√1.2²=1.2√3分之2乘以√8分之27==√(2/3×8/27)=√(16/81)=4/9√2除以3√40=(1/3)√(2÷40)=(1/3)√(1/20)=(1/3)√(5/100)=(1/3)(√5)...