Question

计算：①-³√-1+√25-√144+³√64 ②2√3-3√1\3-√8+1\2√12+1\5√5

Answer 1

①-³√(-1)+√25-√144+³√64

=-(-1)+5-2+4

=1+5-2+4

=8

②2√3-3√(1/3)-√8+1/2√12+1/5√50

=2√3-√(9*1/3)-2√2+1/2*2√3+1/5*5√2

=2√3-√3-2√2+√3+√2

=2√3-√3+√3-2√2+√2

=2√3-√2

③√8+√72/√2+3√3-√75

=2√2+6√2/√2+3√3-5√3

=2√2+6+3√3-5√3

=2√2+6-2√3