Question

Exercițiile 2,4,5,6.
Va rog mult!!!

Answer 1

2)3(x-4)+11<x+23
3x-12+11<x+23
3x-x<23+1
2x<24
x<24:2
x<12

(x-1)(x+3)≤(x+5)²+2
x²+3x-x-3≤x²+10x+25+2
x²-x²+2x-10x≤3+27
-8x≤30
x≤-30/8
x≤-15/4
4)800.....125%
x.............100%
x=800*100/125=640
latura patratului   initial =640;4=160
5)40% -engleza      32%mat.        +7 inf.
40+32=72      100%-72%=28%
28%........7
100%......x
x=100*7/28=25 elevi total
25........100%
x..........32%
x=25*32/100=8 elevi la mate.
25.........1005
x................40%
x=25*40/100=10 elevi la engleza