Odpowiedź:
1. a)5x=17 /:5
x=3,4
b)9y+8=19 /-8
9y=19-8
9y=11 /:9
y≅1,22
c)3b-7=42 /+7
3b=42+7
3b=49 /:3
b≅16,33
d)1/6a-5=-6,1 /+5
1/6a=-6,1+5
1/6a=-1,1 /*6
a=-6,6
2. 2x+12=48 /-12
2x=48-12
2x=36 /:2
x=18
Odp: B.18
3. 5x-7-x=9-2x-4 /+7
5x-x=9-2x-4+7 /+2x
4x+2x=9-4+7
6x=12 /:6
x=2
spr.
5*2-7-2=9-2*2-4
10-7-2=9-4-4
1=1
L=P
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Odpowiedź:
1. a)5x=17 /:5
x=3,4
b)9y+8=19 /-8
9y=19-8
9y=11 /:9
y≅1,22
c)3b-7=42 /+7
3b=42+7
3b=49 /:3
b≅16,33
d)1/6a-5=-6,1 /+5
1/6a=-6,1+5
1/6a=-1,1 /*6
a=-6,6
2. 2x+12=48 /-12
2x=48-12
2x=36 /:2
x=18
Odp: B.18
3. 5x-7-x=9-2x-4 /+7
5x-x=9-2x-4+7 /+2x
4x+2x=9-4+7
6x=12 /:6
x=2
spr.
5*2-7-2=9-2*2-4
10-7-2=9-4-4
1=1
L=P