Răspuns:
10.
[tex]\frac{2x-3}{9} -\frac{x+2}{3} =\frac{2x-7}{18} +\frac{x}{6}[/tex]
Aducem la acelasi numitor, 18. Amplificam fractiile cu 2, 6, 3.
[tex]\frac{2(2x-3)}{18} -\frac{6(x+2)}{18} =\frac{2x-7}{18} +\frac{3x}{18}[/tex]
[tex]4x-6 -6x-12 =2x-7 +3x[/tex]
[tex]-2x-5x=-7+18[/tex]
[tex]-7x=11[/tex]
[tex]x=-\frac{11}{7}[/tex]
11.
[tex]\left \{ {{x=\frac{4y}{3} } \atop {2x-y=45}} \right.[/tex]
[tex]2*\frac{4y}{3} -y=45[/tex]
[tex]8y-3y=45*3[/tex]
[tex]5y=135\\y=27[/tex]
[tex]x=\frac{4*27}{3} \\x=4*9\\x=36[/tex]
Explicație pas cu pas:
