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zad. rozwiąż równania i sprawdź :
2a-5=10
2a + 5 =37
1/2 a +5=12
z góry dzięki :*
2a=10+5
2a=15
a=15/2
a=7,5
Spr. 2*7.5-5=10
15-5=10
10=10
L=P
2a+5=37
2a=37-5
2a=32
a=32/2
a=16
Spr.
2*16+5=47
32=5=37
37=37
a +5=12
a=12-5
a= 7
a= 7*2
a=14
Spr
* 14 +5=12
7+5=12
12=12
a)
2a - 5 = 10
2a = 10 +5
2a = 15|:2
a= 15/2
a= 7,5
Spr :
2*7,5 - 5= 15 -5 = 10 | L=P
b)
2a +5 = 37
2a = 37 - 5
2a= 32| :2
a= 16
2*16 + 5 = 32 + 5 = 37 | L=P
c) 1/2a +5 = 12
1/2a = 12-5
1/2a = 7 | : 1/2
a= 7 / 1/2
a= 7/1 * 2/1
a= 14
Spr:
1/2 *14 +5 = 7 +5 = 12 | L=P
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2a-5=10
2a=10+5
2a=15
a=15/2
a=7,5
Spr. 2*7.5-5=10
15-5=10
10=10
L=P
2a+5=37
2a=37-5
2a=32
a=32/2
a=16
Spr.
2*16+5=47
32=5=37
37=37
L=P
a +5=12
a=12-5
a= 7
a= 7*2
a=14
Spr
* 14 +5=12
7+5=12
12=12
L=P
a)
2a - 5 = 10
2a = 10 +5
2a = 15|:2
a= 15/2
a= 7,5
Spr :
2*7,5 - 5= 15 -5 = 10 | L=P
b)
2a +5 = 37
2a = 37 - 5
2a= 32| :2
a= 16
Spr :
2*16 + 5 = 32 + 5 = 37 | L=P
c) 1/2a +5 = 12
1/2a = 12-5
1/2a = 7 | : 1/2
a= 7 / 1/2
a= 7/1 * 2/1
a= 14
Spr:
1/2 *14 +5 = 7 +5 = 12 | L=P