zad . 3 str. 114 Rozwiąż równania i sprawdź .
a) 3x + 5 = 21
b) 4x + 3 3/5 = 6
c) 45 - 2y = 25
d)6 2/5 - 5y = 1,4
e) 4z - 3 = 5
f) 3z - 2 = 16,3
g) 7 +5t = 32
h) 6 3/10 + 2t = 14 1/2
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a)3x + 5 = 21
3x=21-5
3x=16 /:3
x=5 i 1/3
Spr
3*5 1/3 + 5=21
16+5=21
b)4x + 3 3/5 = 6
4x=6-3,6
4x=2,4 /:4
x=0,6
Spr
4*0,6+3,6=6
2,4+3,6=6
c)45 - 2y = 25
2y=45-25
2y=20
y=10
Spr
45-2*10=25
45-20=25
d)6 2/5 - 5y = 1,4
6,4-1,4=5y
5=5y
y=1
Spr
6,4-5*1=1,4
6,4-5=1,4
e) 4z - 3 = 5
4z=5+3
4z=8
z=2
Spr
4*2-3=5
8-3=5
f) 3z - 2 = 16,3
3z=16,3+2
3z=18,3
z=6,1
Spr
3*6,1-2=16,3
18,3-2=16,3
g) 7 +5t = 32
5t=32-7
5t=25
t=5
Spr
7+5*5=32
7+25=32
h) 6 3/10 + 2t = 14 1/2
2t=14,5-6,3
2t=8,2
t=4,1
Spr
6,3+2*4,1=14,5
6,3+8,2=14,5