已知√5≈2.236,求(√80-√9/5)-(√16/5+4/5×√45)的值.(结果精确到0.01)
问题描述:
已知√5≈2.236,求(√80-√9/5)-(√16/5+4/5×√45)的值.(结果精确到0.01)
答
(√80-√9/5)-(√16/5+4/5×√45)
=4√5 -3/5√5-4/5√5-4/5x3√5
=4√5-(3/5+4/5+12/5)√5
=4√5-19/5√5
=1/5√5
=1/5x2.236
=0.4472
答
(√80-√9/5)-(√16/5+4/5×√45)
=4√5 -3/5√5-4/5√5-4/5x3√5
=4√5-(3/5+4/5+12/5)√5
=4√5-19/5√5
=1/5√5
=1/5x2.236
=0.4472