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1. 4√8 +3√2 +6√32-5√50= 8√8+3√2+24√2-25√2=13√2
2.(3√8+√18+√50)*√2=(6√2+3√2+5√2)*√2=13√2*√2=26
3.(4√12+7√27+√48+√75):√3=(8√3+21√2+4√3+5√3):√3=38√3:√3=38
Odnośnie komentarza ;)
√4=2
4√8=4√4*2=4*2√2=8√2