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4. Să se efectueze: (a)[-6.(-5+2)-(-3)]: (-7)+(4-9) = b) (-12): (-6+3) — c)-8+2.31 (-10+15)-|2-4|= e) (−8 +10) ·|-5|-|-3+3.1| (-4+8)= g)|-3+2|-14+(-6)|+|-23= 1) [1-(-3).5+(-2).3]:2= d) 23-1-2+3|·|-51 f)|-12+6+(-4)|: h) [(-3) (9-5)-( j) [-2 (5-7)+1-4 (k)[-3+5.(-2)-(-28):4-(6-12)] (-1) = 1)-12:3-(-8). (4 m) (-5+6).[2-(-3). (-2)+(-8)]: (-3)= n) (-24): (32-20) o)-[-(7-15): (-4)+(-3+5)-(-10)] =​