Question

Va rog am mare nevoie

Answer 1

1.(-3/17):9/34=-3/17 ×34/9=-2/3

2.(0,2)⁻²=(1/5)⁻²=5²=25
4-I-1/3I-0,(6)=4-1/3-6/9=4-1/3-2/3=4-3/3=4-1=3
ma=(25+3)/2=28/2=14

3.4-x/2=1 2/3 × x+1/6
4-x/2=5x/3+1/6
24-3x=10x+1
13x=23
x=23/13

4.I(x-1)/3I=1/2
(x-1)/3>0
(x-1)/3=1/2
2x-2=3
2x=5
x=5/2
(x-1)/3<0
-(x-1)/3=1/2
-2x+2=3
2x=-1
x=-1/2

1.x=(-1/3)³=-1/27
y=-1 5/6 -(-7/9)=-11/6+7/9=(-33+14)/18=-19/18
x+(-y)=-1/27+[-(-19/18)]=-1/27+19/18=(-2+57)54=55/54=1 1/54      
raspuns corect  C.  1 1/54

2.a=1-1/2+1/3=(6-3+2)/6=5/6
b=(-1 1/5)⁻²=(-6/5)⁻²=1/(-6/5)²=(5/6)²=25/36
a×1/b=5/6× 36/25=6/5
raspuns corect B.   6/5

3.(1-3n)/7 >-1     1-3n>-7      3n<8      n<8/3
(1-3n)/7 ≤2     1-3n≤14      3n≥-13      n≥13/3
A={4,3,2,1,0,1,2}       raspuns corect C. 7

4. 1 1/5- 2 1/3 =6/5-7/3=(18-35)/15=-17/15= -1,1(3)
[-1,1(3)]=-2
raspuns corect B.  -2

5.  4-I1-x/12I=0,25    
x                   -∞              12              +∞
1-x/12           + + + + +   0   - - - - - - - -
x+(-∞,12]    4-1+x/12=0,25      x/12=0,25-3=-2,75     x=-33
x+[12,+∞)    4-[-(1-x/12)]=0,25   4+1- x/12=0,25   x/12=4,75    x=57

6.100%-15%=85%
114,75:85%=135 lei

100%-10%=90%
135:90%=150 lei pret initial