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4. Să se efectueze: a) [-6-(-5+2)-(-3)]: (-7)+(4-9)= c) -8+2-31-(-10+15)-12-41= e) (-8+10)-1-5-1-3+3-11-(-4+8)= g) 1-3+21-14+(-6)|+|-213= i) [1-(-3)-5+(-2)-3]:2= b) (-12) (-6+3)-(-2)-5= d) 23-1-2+31-1-5|+(-7)= f) |-12+6+(-4)|:|-10+5|= h) [(-3) (9-5)-(6-10)]: (-2)-|10- j) [-2-(5-7)+1-4-81-(-2)]: (-3)= k) [-3+5.(-2)-(-28):4-(6-12)]. (-1) = 1) -12:3-(-8)-(4-5)+10: (7-9) = m) (-5+6) [2-(-3) (-2)+(-8)]: (-3)= n) (-24): (32-20)-(-6):3= o)-[-(7-15): (-4)+(-3+5)-(-10)]=​