Question

a rog mult ...am de rezolvat urgent niste exercitii la mate,pana la ora 16..eu am facut,dar vreau sa stiu daca e corect .va pup!!! Multumesc! sa rezolve cineva ex:
a) 3x - 5 =2x- x +1
b) 5x- 3 +2x - 1= 3x -7-2x
c) 3-2x+5x-7=2x-3+5x-2
d) 5v-2 + 3-2v =-1+3v-2v+7
e) 2x-3 - 5x+2=7x+3-5x+1
f) 3 (u-2) - 2 (u+1) =5 (u+3) - 27
g) 3x -2 (x-1)= 3 ( x+2)

Answer 1

$\displaystyle a).3x-5=2x-x+1 \\ 3x-2x+x=1+5 \\ 2x=6 \\ x= \frac{6}{2} \\ x=3 \\ b).5x-3+2x-1=3x-7-2x \\ 5x+2x-3x+2x=-7+3+1 \\ 6x=-3 \\ x=- \frac{3}{6} \\ x=- \frac{1}{2}$
$\displaystyle c).3-2x+5x-7=2x-3+5x-2 \\ -2x+5x-2x-5x=-3-2-3+7 \\ -4x=-1 \\ x= \frac{1}{4} \\ d).5v-2+3-2v=-1+3v-2v+7 \\ 5v-2v-3v+2v=-1+7+2-3 \\ 2v=5 \\ v= \frac{5}{2}$
$\displaystyle e).2x-3-5x+2=7x+3-5x+1 \\ 2x-5x-7x+5x=3+1+3-2 \\ -5x=5 \\ x=- \frac{5}{5} \\ x=-1 \\ f).3(u-2)-2(u+1)=5(u+3)-27 \\ 3u-6-2u-2=5u+15-27 \\ 3u-2u-5u=15-27+6+2 \\ -4u=-4 \\ u= \frac{-4}{-4} \\ u=1$
$\displaystyle g).3x-2(x-1)=3(x+2) \\ 3x-2x+2=3x+6 \\ 3x-2x-3x=6-2 \\ -2x=4 \\ x=- \frac{4}{2} \\ x=-2$