Question

Dau coroana si 34 pcte pls help me

Answer 1

4)
A |---|---|---|---|---|
b |---|------5085-----]
5085-141=4944
4944:4=1236
a=1236•5+141=6321
b=1236
5)
b € {0,5}
a € {0,1,2,3.....9}
2×10=20 fracții
6)
x+x+x=6
2x+x=6
3x=6
x=6:3
x=2

3•x+4=2•x+11
3x-2x=11-4
x=7

2•(x+3)=6
2•3=6
x+3=3
x=3-3
x=0
7)
Cu niciun zero!Niciun factor nu se divide cu 5.
8)
2²=4
4²=16
6²=36
8²=64
10²=100
9)
(35+36+4•34)=
=35+36+136=
=71+136=207=>Nu este pătrat perfect
10)
1³=1
2³=8
3³=27
4³=64
11)
(122-24-22+1)=
=122-24-22+1=
=98-22+1=
=76+1=77=>Nu este cub perfect
12)
x+2^0•(2^1990•2+2^1991+2^1992)=2^1994
x+1•(2^1991+2^1991+2^1992)=2^1994
x+[2^1991(1+1+2¹)+2^1992]=2^1994
x+[2^1991×2+2^1992]=2^1994
x+(2^1992+2^1992)=2^1994
x+2^1992×2=2^1994
x+2^1993=2^1994
x=2^1994-2^1993
x=2^1993(2-2^0)
x=2^1993(2-1)
x=2^1993