Question

calculatimi va rog urmatoarele exercitii 2a+3a=50-25 3b+b=124 25+x+3x-x=85 5z+5z-10=90 2y+3y-3y=7 4(y+2)-2=30

Answer 1

2a + 3a = 50 - 25
5a = 25
a = 25 : 5
a = 5
3b + b = 124
4b = 124
b = 124 : 4
b = 31
25 + x + 3x - x = 85
3x = 85 - 25
x = 60 : 3
x = 20
5z + 5z - 10 = 90
10z = 90 + 10
z = 100 : 10
z = 10
2y + 3y - 3y = 7
2y = 7
y = 7/2   =>  y = 3 intregi si 1/2
4(y + 2) - 2 = 30
4y + 8 - 2 = 30
4y = 30 + 2 - 8
y = 24 : 4
y = 6

Answer 2

$\displaystyle a).2a+3a=50-25 \\ 5a=25 \\ a= \frac{25}{5} \\ a=5 \\ b).3b+b=124 \\ 4b=124 \\ b= \frac{124}{4} \\ b= 31 \\ c). 25+x+3x-x=85 \\ x+3x-x=85-25 \\ 3x=60 \\ x= \frac{60}{3} \\ x=20$
$\displaystyle d).5z+5z-10=90 \\ 5z+5z=90+10 \\ 10z=100 \\ z= \frac{100}{10} \\ z=10 \\ e).2y+3y-3y=7 \\ 2y=7 \\ y= \frac{7}{2} \\ f).4(y+2)-2=30 \\ 4y+8-2=30 \\ 4y=30-8+2 \\ 4y=24 \\ y= \frac{24}{4} \\ y=6$