Question

Calculați (12,5/12+1,2/3-3,5/6+2,3/4)÷(2,1/2x2/5-7/9)

Answer 1

(125/120+12/30-35/60+23/40)÷(21/20x2/5-7/9)
la prima paranteza dai numitor comun :120; la a doua paranteza simplifici la inmultire: 
(125+4*12-2*35+3*23)/120÷(21/10x1/5-7/9)=
(125+48-70+69)/120÷(21/50-7/9)=
la a doua paranteza dai numitor comun : 450
172/120÷(21*9-7*50)=
43/30÷(189-350)=
43/30÷(-161)=
-0.008902