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1. Aflati a din egalitatea: 48-[24-(70-2xa):2]x6=6

Răspuns :

48-[24-(70-2a):2]6=6; [24-(70-2a):2]6=48-6=42; 24-(70-2a):2=42/6=7; (70-2a):2=17; 70-2a=34; 2a=70-34; 2a=36; a=36/2=18
48-[24-(70-2*a):2]*6=6
[24-(70-2*a):2]*6=48-6
[24-(70-2*a):2]*6=42 | :6
24-(70-2*a):2=7 
(70-2*a):2=24-7
(70-2*a):2=17 | *2
70-2*a=34
2a=70-34
2a=36
a=18
Sper ca te-am ajutat!!!