Question

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Rozwiaz równanie:
b) 3/5y+2/5=4
c)3(y+2)=5
d) 7(y+3)=5y+2+2y
f) y+3/2 -(1-y)=3,5
h) 2y+4/4=1/2y+2
i) y-2/3+1/15-2y-5/3=8-4y/5
j) y-5/2+2y+3/5+1/3=y+7/15+y/2

Answer 1

C) 3(y+2)=5
3y + 6=5
3y=-1
y= -1/3

Answer 2

1)3/5y+2/5=4 |-2/5
3/5y=3 3/5
y=6
2)3(y+2)=5
3y+6=5 |-6
3y=-1 |:3
y=1/3

3)7(y+3)=5y+2+2y
7y+21=7y+2 |-7y
21=2
równanie sprzeczne
4)y+3/2 -(1-y)=3,5
y+1,5-1+y=3,5
2y +0,5=3,5 |-0,5
2y=3 |:2
y=3
5) 2y+4/4=1/2y+2
2y+1=1/2y+2 |*2
4y+2=y+4 |-y-2
3y=2 |:3
y=2/3
6) y-2/3+1/15-2y-5/3=8-4y/5
-y-4/15=8-4y/5 |*5
-5y-4/3=40-4y |+4v
-y=41 1/3
y=-41 1/3
7) y-5/2+2y+3/5+1/3=y+7/15+y/2
3y-1 9/10 +1/'3=y+7/15+y/2
2y-y/2=2/15-19/10
2y-y/2=4/30-48/30
2y-y/2=44/40 |*2
3y=44/15 |:3
y=8 4/5