1. a) *10-(5+3)=10-8=2
10-5-3=2
*10-(5+3)=10-8=2
10-5+3=5+3=8
2≠8
b)*15-(5-2)=15-5-2=8
15-5-2=8
*15-(5-2)=15-5-2=8
15-5+2=12
8≠12
c)*20-(6+4)=20-10=10
20-6+4=24+4=28
10≠28
*20-(6+4)=20-10=10
20-6-4=10
d)*12+(8-3)=12+5=17
12+8-3=20-3=17
*12+(8-3)=17
12-8+3=4+3=7
17≠7
2.
7-(-k+5)=7+k-5=2+k
7+(k+5)=7+k+5=12+k
7-(k+5)=7-k-5=2-k
7-(k-5)=7-k+5=12-k
Liczę na naj ;)
