1. ⅔: [⅓+3(2-⅔*⅔)]+6 = ⅔:[⅓+6-4/3+2]+6 = ⅔:7+6=2/21+6 = 6 2/21
2. 10²-3*10*4+4 = 100-120+4 = -16
3. 3*(⅓)² +2 [(⅓)² -3(2*(⅓)-1)] = 3*1/9+2[1/9-2+3] = 1/3+2/9+2 = 3/9+2/9+18/9 = 23/9 = 2 i 5/9
4. [16*(¼)-2] / [2,1-6,4 * (¼)³ + ¼] = 2 / [2,1-6,4*1/64+1/4] = 2 / [21/10-64/10*1/64+1/4] = 2/ [21/10-1/10+1/4] = 2/[9/4] = 2*4/9=8/9
5. 8(3√2-1)/3*(1-2√2²-2)(2√2² +5)/5-3√2² = (8√2-8/3)*(-1-8)(8/5+1)-18 = (8√2-8/3)*(-9)*13/5-18 = -72√2+24*13/5-18 = -936√2/5+312/5-18=-936√2/5+312/5-90/5 = (-936√2+222)/5=-187,2√2+44,4
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