Ex.11,punctele b,c,d
Răspunsuri la întrebare
1)11/4+21/4=32/4=8
2)16/5+25/6=221/30
3)47/6+47/4=611/42
11
b ) 4,5 + 1,( 3) + 3 intregi si 2 / 5 =
4, 5 = 45 / 10 = 9 / 2
1,(3) = ( 13 - 1 ) / 9 = 12 / 9 = 4 / 3
3 intregi si 2 / 5 = ( 3 x 5 + 2 ) / 5 = 17 / 5
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= 9 / 2 + 4 / 3 + 17 / 5 =; cmmmc al numitorilor 2; 3 si 5 = 2 x 3 x 5 = 30
= ( 15 x 9 ) / 30 + ( 10 x 4 ) / 30 + ( 6 x 17 ) / 5 =
= 135 / 30 + 40 / 30 + 102 / 30 =
= 277 / 30 =
= 9 intregi si 7 / 30 =
= 9,2(3)
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c) 5 / 12 + 3 intregi si 1/ 6 + 0,0(6) =
3 intregi si 1 / 6 = ( 3 x 6 + 1 ) / 6 = 19 / 6
0,0(6) = 6 / 90 = 1 / 15
= 5 / 12 + 19 / 6 + 1 / 15 =
cmmmc al numitorilor 12; 6 si 15 = 3 x 4 x 5 = 60
= ( 5 x 5 ) / ( 5 x 12 ) + ( 10 x 19 ) / 60 + 4 / 60 =
= ( 25 + 190 + 4 ) / 60 =
= 219 / 60 =
= 73 / 20 =
= 3,65
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d) 5 intregi si 1 / 10 + 0,7 + 4 intregi si 1 / 2 =
5 intregi si 1 / 10 = ( 5 x 10 + 1 ) / 10 = 51 / 10
0.7 = 7 / 10
4 intregi si 1 / 2 = ( 4 x 2 + 1 ) / 2 = 9 / 2
= 51 / 10 + 7 / 10 + 9 / 2 =
= 58 / 10 + 45 / 10 =
= 103 / 10 =