Răspuns :
Răspuns:
1)
1 2/5 + 3 3/5 + 11/30 + 9/30 =?
(1*5+2) / 5 + (3*5+3) / 5 + 11/30 + 19/30
7/5 + 18/5 + 11/30 + 19/30
(42+108+11+19) / 30 = (150+30) / 30 = 180/30 = 18/3 = 6
2)
a=6 1/2 + 3 2/3 - 4 1/6
a=(6*2+1) / 2 + (3*3+2) / 3 - (4*6+1) / 6
a=13/2 + 11/3 - 25/6 => a=(39+22-25) / 6 => a=(61-25) / 6 = 36/6 = 6 => a=6
b=11 5/6 - 8 5/12 - 1
b=(11*6+5) / 6 - (8*12+5) / 12 - 1
b=71/6 - 101/12 - 1 => (142-101-12) / 12 = > b=29/12
E = 2/3 + a-b => 2/3 + 6-29/12 = (2+18) / 3 - 29/12 = 20/3 - 29/12 = 80/12-29/12 = 51/12
E=2/3 + a-b = 51/ 12
Răspuns:
Salut
Ex,1.
1 2/5+3 3/5+11/30+19/30=
2/5+9/5+11/30+19/30=
16/5.
Ex,2.
a= 6 1/2+3 2/3-4 1/6=
3+2-2 1/3=
5-2/3=13/3.
b=11 5/6-8 5/12-1=55/6-10/3-1=29/6.
E= 2/3 + 13/3 - 29/6 = 4+26-29/6= 1/6.
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