Question

Va roggg sa ma ajutați la exercițiile 2 4 11 13 14 15 și 16 va rog mult Coroana plssss

Answer 1

2.
{[(21-1+22):7+6]:3}+13=
[(42:7+6):3]+13=
(12:3)+13=
4+13=
17

4.
A=5⁸·(5²+6·5+9)
A=5⁸·(25+30+9)
A=5⁸·64
A=5⁸·2⁶

11.
2ˣ⁺⁵=2⁶ =>x+5=6 =>x=1

13.
4x-20-155=5
4x=5+20+155
4x=180
x=45

14.
[(x+58)·3+4]·11=1991
(x+58)·3+4=1991:11
(x+58)·3+4=181
(x+58)·3=181-4
(x+58)·3=177
x+58=177:3
x+58=59
x=1

15.
18x-14≥6x+10
18x-6x≥10+14
12x≥24
x≥2 =>x={0,1,2}

16.
A∪B={0,1,2,3,5,6,8}
B∩C={0,3}
C-A={0,4,7,9}
A∩C={3}
(B∪C)-A={0,1,2,3,4,7,9}-{2,3,5,6,8}={0,1,4,7,9}