vaa rogggg e urgenttt dau 30 puncte și corona

Răspuns:
Explicație pas cu pas:
rezolvare
a)
[11/6-(²⁾7/3+1/6):15/7=
[11/6-(14/6+1/6):15/7=
11/6-15/6:15/7=
11/6-15/6*7/15=
11/6-7/6=
4/6=2/3
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b)
7/2+11/2=18/2=9
-
c)
1+(2/5)¹⁷:(2/5)¹⁵=
1+(2/5)¹⁷⁻¹⁵ =
1+(2/5)²=
²⁵⁾1+4/25=
(25+4)/25=
29/25
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d)
3*(x+3)=2*15
3x+9=30
3x=30-9
3x=21
x=21:3
x=7