是“已知√5≈2.236 ,求5√(1/5)-(5/4)√(4/5)+√45的近似值”吗?
5√(1/5)-(5/4)√(4/5)+√45
=√5-√(5/4)+√45
=√5-(1/2)√5+3√5
=(7/2)√5
=3.5*2.236
=7.826
是“已知√5≈2.236 ,求5√(1/5)-(5/4)√(4/5)+√45的近似值”吗?
5√(1/5)-(5/4)√(4/5)+√45
=√5-√(5/4)+√45
=√5-(1/2)√5+3√5
=(7/2)√5
=3.5*2.236
=7.826