Question

计算：2根号7-根号7/2+8/3根号7

Answer 1

2根号7-根号7/2+8/3根号7

=(2-1/2+8/3)√7

=25/3√7

(-根号3)^2+3根号3*根号18

=3+3√54

=3+6√6

(2-根号5)^2-(2+根号5)^2

=(2-√5+2+√5)(2-√5-2-√5)

=4x(-2√5)

=-8√5

5^1/3*5^-2÷根号5

=5^1/3*5^-2*5^-1/2

=5^(1/3-2-1/2)

=5^-13/6

(3^1/2+5^1/2)^2

=(√3+√5)²

=3+2√15+5

=8+2√15