Question

[(3x-2)X5-1]:2+5=7
{[(6-x)X2-7]X9-5}:2=2

Answer 1

Inlocuim paranteza rotunda cu o litera si scriem (a×5-1):2+5=7 Inlocuim iarasi paranteza b:2+5=7 b:2=7-5 b:2=2 b=2×2=4 a×5-1=4 a×5=4+1 a×5=5 a=1 3x-2=1 3x=3 x=1 Exercitiul 2procedam la fel [(a×2-7)×9-5]:2=2 (b×9-5):2=2 c:2=2 c=4 b×9-5=4 b×9=4+5 b×9=9 b=9:9=1 a×2-7=1 a×2=1+7 a×2=8 a=8:2 a=4 6-x=4 x=6-4 x=2