1.
2√75-3√27+√12
=10√3-9√3+2√3
=3√3
2.
√72+√18-3√2/2
=6√2+3√2-3√2/2
=15√2/2
2倍根号75-3倍根号27+根号12
=10根号3-9根号3+2根号3
=3根号3
根号72+根号18-3倍根号2/2
=6根号2+3根号2-1.5根号2
=7.5根号2
解:
(1)2根号75-3倍根号27+根号12 =2根号(5*5*3)-3根号(3*3*3)+根号(2*2*3)
=(2*5)根号3-(3*3)根号3+2根号3=10根号3-9根号3+2根号3=3根号3
(2)根号72+根号18-3倍根号2/2=根号(6*6*2)+根号(3*3*2)-3/2根号2
=6根号2+3根号2-3/2根号2=(9-3/2)根号2=15/2根号2