Rozwiąż równania!
Legenda: 1/2 czyli jedna druga
a) 1/2y+3=7
b) 3/5y+2/5=4
c) 3(y+2)=5
d) 7(y+3)= 5y+2+2y
e) y/2+1/3=7/6
f) y+3/2-(1-y)= 3,5/ *2
g) 1/5(y-3) - 3/5 ( y- 3/5) + 1/3= 2/5-1/5 (2y-5)
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a) 1/2y+3=7
0,5y = 4 /:0,5
y = 8
b) 3/5y+2/5=4 /*5
3y + 2 = 20
3y = 18 /:3
y = 6
c) 3(y+2)=5
3y + 6 = 5
3y = -1 /:3
y = -1/3
d) 7(y+3)= 5y+2+2y
7y + 21 = 5y + 2 + 2y
0 = -19 równanie sprzeczne.
e) y/2+1/3=7/6 /*6
3y + 2 = 7
3y = 5 /:3
y = 5/3
f) y+3/2-(1-y)= 3,5
y + 3/2 - 1 + y = 3,5 /*2
2y + 3 - 2 + 2y = 7
4y = 6 /:4
y = 1,5
g) 1/5(y-3) - 3/5( y- 3/5) + 1/3= 2/5-1/5 (2y-5)
y/5 - 3/5 - 3y/5 + 9/25 + 1/3 = 2/5 - 2y/5 + 1 /*75
15y - 45 - 45y + 27 + 25 = 30 - 30y + 75
0 = 98 równanie sprzeczne.