Đáp án:
Giải thích các bước giải:
1)√55.√77.√35
=√5.√11.√11.√7.√7.√5
=5.11.7=385
2) 2√2 -√125 -√80+√605
=2√2 -5√5 -4√5 +11√5
=2√2 -2√5
=2.(√2 -√5)
3)2√98 -3√12-3√18 +2√27 +√14,4.√10
= 2√7^2 .2 -3.√2^2.3 +2.√3^2.3 +√144
=14.√2 -6√2 +6√3 +12
=8√2 +6√3 +12
4) (√108 -√48 -2√75 -3√27 -√147) :√3
=√36 -√16 -2√25 -3√9 -√49
=6 -4 -10 -9 -7
=-24
5)2√7 -6√4/3 +3/5 √75
=√2.2.7 -√6.6.4/3 +√75 .3/5.3/5
=√28 -√48 +√27
6) √8/3 -√24 -√50/3
=√2².2/3 -√72/3 -√5^2 .2/3
=2√2/3 -√6^2.2/3 -5.√2/3
=2√2/3 -6√2/3 -5√2/3
=-9√2/3
=-√2.3/3
=-√2
7) √18/√2 +√27/√3 -√125/√5
=√18/2 +√27/3 -√125/5
=√9+√9 -√25
=3+3-5 =1
8)2√16/3 -3√1/27 -6√4/75
=2.√4^2.1/3 -√9.1/27 -3,5√25/4 .4/75
=2.4√1/3 -√1/3 -3,5√1/3
=8√1/3 -√1/3 -3,5√1/3
=3,5√1/3