Ex 1
(0,25+3/4)/0,5-(1/2-1/3)x5/6
(1/4 + 3/4)/(1/2)-(3/6 - 2/6)x5/6
1/(1/2) - (1/6)(5/6)
2- 5/36=(72-5)/36=67/36
Ex 2
400-5x{32+(-2)x[18-2(16-(-2))]}+(-5) la puterea 4 :(-5)²
400-5x{32+(-2)x[18-2x18]}+(-5)la puterea (4-2)
400-5x{32+(-2)x[-18]}+(-5)²
400-5x{32+36}+25
425-5x68=425-340=85