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Rezolvati in Q ecuatiile: a)7x-5=8;b) x+1supra 5=-2;c) ,d) 3(x-1)+5=11; e) 1 supra 5( 1 supra 5 x+3 supra 5 )=1; f)0,25x-0,3=0,2x-0,75;g) 4x+6=3x-3+7 ;
repede


Răspuns :

a)7x=3⇒x=3 supra 7
b)x+1=-10
x=-11
d)3x-3 +5=11
3x+2=11
3x=9
x=3
..................................:)))le rezolv pe o foaie si trimit poza

Vezi imaginea IONUTILENEI
Vezi imaginea IONUTILENEI
Vezi imaginea IONUTILENEI
   
[tex]\displaystyle a) \\ 7x-5=8 \\ 7x=8+5 \\ 7x=13 \\ x= \boxed{\frac{13}{7}} \\ \\ b) \\ x+ \frac{1}{5} =-2\\ \\ x=-2-\frac{1}{5} = - \frac{10}{5} -\frac{1}{5} =\frac{-10-1}{5} = \boxed{\frac{-11}{5}}\\ \\ c)[/tex]


[tex]\displaystyle d) \\ 3(x-1)+5=11 \\ 3x-3+5=11 \\ 3x= 11+3-5 \\ 3x = 9 \\ x = \frac{9}{3} =\boxed{3} \\ \\ e) \\ \frac{1}{5}\left(\frac{1}{5}x+\frac{1}{5}\right)=1 \\ \\ \frac{1}{25}x+\frac{1}{25}=1 \\ \\ \frac{1}{25}x=1-\frac{1}{25} ~~~=\ \textgreater \ ~~~ \frac{1}{25}x=\frac{24}{25} ~~~=\ \textgreater \ ~~~x= \frac{24}{25} \times\frac{25}{1} = \boxed{24}[/tex]


[tex]f) \displaystyle \\ 0,25x-0,3=0,2x-0,75 \\ 0,25x-0,2x=-0,75+0,3 \\ 0,05x= -0,45 \\ \\ x= \frac{-0,45}{0,05} = \frac{-45}{5}= \boxed{-9}\\ \\ g) \\ 4x+6=3x-3+7 \\ 4x-3x =-3+7-6 \\ x= \boxed{-2}[/tex]