计算①2/5*√8/3÷√16又2/3 ②-√17÷√85*√1/5

问题描述:

计算①2/5*√8/3÷√16又2/3 ②-√17÷√85*√1/5

①2/5*√8/3÷√16又2/3
=2/5×√8/3÷√50/3
=2/5×(√24)/3÷(√150)/3
=2/5×(√24)/3×3/(√150)
=2/5×(√24)/(√150)
=2/5×√(24/150)
=2/5×√(4/25)
=2/5×2/5
=4/25
②-√17÷√85*√1/5
=-√(17×1/85×1/5)
=-√(1/25)
=-1/5