Question

De la partea II-a toate cele 4 exerciții!!!Va rog!

Answer 1

1.
a)x=6/5 - 3/5
   x=3/5
b)x=6/25 · 5/2
   x=3/5
c)x=12/5 · 5/2
   x=6
d)x=25/10 · 4/25
   x=4/10=0,4 =>raspuns d

2.
x+2≤15/10 · 8/3
x+2≤4
x≤2 =>x∈{0,1,2}
=>suma=3 =>raspuns a

3.
1,5<4,5x-27-3≤10,4
1,5<4,5x-30≤10,4  l+30
31,5<4,5x≤40,4  l:4.5
7<x≤9 =>x∈{8,9}

4.
P=2L+2l
l=L-0,2
2,8=2L+2(L-0,2)
2,8=2L+2L-0,4
2,8+0,4=4L
3,2=4L
=>L=0,8 m =>raspuns a