Question

Rozwiąż równania:
a) 12y-(y+5)=10y-1
b) 2(u-5)+15=3(u-4)+10
c) -3(y/3+1)-2=4(1-y)
d) 2(3a-2)-6=4,5(2a-1)+1/2

Answer 1

A) 12y-y-5=10y-1
11y-5=10y-1
11y-10y=5-1
y=4
b)2u -10+15=3u-12+10
2u+5=3u-2
2u-3u= -2-5
-u= -7   /*(-1)
u=7
c) (-3y/3+1)-2 =4-4y
-3y/4 -2=4-4y      /*4
-3y -8=16-16y
-3y+16y=16 +8
13y= 24   /;13
y=24/13
d) 6a -4 -6 = 9a -4,5 +1/2
6a - 9a =  -4,5+1/2 +4+6
-3a = -5,5+1/2
-3a = -5 /;(-3)
a= 5/3
licze na naj ;)

Answer 2

a) 12y-(y+5)=10y-1
12y-y-5=10y-1
12y-y-10y=5-1=
y=4
b) 2(u-5)+15=3(u-4)+10
2u-10+15=3u-12+10
2u-3u=10-15-12+10
-u=-7 |:(-1)
u=7
c) -3(y/3+1)-2=4(1-y)
-1y-3-2=4-4y
-y+4y=4+3+2
3y=9 |:3
y=3
d) 2(3a-2)-6=4,5(2a-1)+1/2
6a-4-6=9a-4,5+0,5
6a-9a=-4,5+0,5+4+6
-3a=14