Răspuns:
Explicație pas cu pas:
1)
B={ 3/4, 6/5 ,1/7 ,1¹/₂ , 1 , 4,6 , 20/23}
C={ - 0,25 , -1 , - 13/14 , -5 , -8/9 }
D={-1 ,0 ,-5 }
E={-5 }
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2)
a)
A∩D= {-1,0,-5}
b)
C/D={-0,25 , -13/14 , -8/9 }
c)
D∪E= {-1 ,0, -5 }
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2)
= -³⁾3/4-²⁾5/6
=-9/12-10/12
= - 19/12
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3)
a)
3x-2=6
3x= 6+2
3x=8
x= 8/3
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b)
7x/8=5/4
7x*4=8*5
28x=40
x=40⁽⁴/28⁽⁴
x= 10/7
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4)
x= lungimea drumului
5x/9= 300
x=(300*9)/5
x= 2700:5
x= 540 m ( distanta pana la scoala ) )
