ajutor la aceasta ora de inchisoare
Răspunsuri la întrebare
Răspuns:
Explicație pas cu pas:...................................................
Răspuns:
Explicație pas cu pas:
h)
0,(5) + 0,(4) = 5/9 + 4/9 = 9/9 = 1
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i)
0,(35) + 0,(13) = 35/99 + 13/99 = 48/99 = 16/33 = 0,(48)
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j)
0,(7) + 0,(51) = 7/9 + 51/99 = (77+51)/99 = 128/99 = 1,(29)
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k)
0,(75) + 2,(5) = 75/99 + (25-2)/9 =
= 75/99 + 23/9 =
= ( 75 + 23×11 ) /99 =
= 328/99 =
= 3,(31)
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l)
12,3(4) + 0,5(6) = (1234 - 123)/90 + (56-5)/90 = (1111+51)/90 = 1162/90 = 12,9(1)
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m)
2,5(15) + 3,(21) = (2515 - 25)/990 + (321-3) /99 = (2490 + 3280)/990 = 6770/990 = 6,(83)
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n)
0,(135) + 0,(531) = 135/999 + 531/999 = 666/999 = 222/333 =2/3=0,(6)
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p)
3,2 + 1/5 = 32/10 + 1/5 = 16/5 + 1/5 = 17/5 = 3,4
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r)
(2×3+1)/3 + 25/100 + 5/9 =
= 7/3 + 1/4 + 5/9 =
= (12×7)/36 + 9/36 + 20/36 =
= (84 + 29) / 36 =
= 113/36 =
= 3,13(8)
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s)
0,45 + 2,(3) + 3,(15) + 5,55 =
= 45/100 + (23-2)/9 + (315-3)/99 + 555/100 =
= 9/20 + 21/9 + 312/99 + 111/20 =
= 120/20 + (21×11 + 312)/99 =
= 6 + 543/99 =
= (6×33 + 181)/33 =
= 389/33 =
= 11,(78)