a) 2,5 + 2 * 1/2 =5/2 + 2/2 = 7/2 = 3,5
2,5 + 1 = 3,5
1,2 - (0,1+ 2/5) = 12/10 -(1/10 + 4/10)=12/10-5/10 = 7/10
0,4 * 1/4 + 7 = 4/10*1/4 + 7 = 1/10+7=7 1/10
4,4 : 4 + 1/4 = 44/10 *1/4 + 1/4 = 11/10 + 1/4 = 44/40 + 10 /40 = 54/40 = 1 7/20
b) 2/5 + (2 * 0,5) =2/5 + 1 = 1 2/5
2/3 * 6 : 1/4 = 4 * 4 = 16
( 0,5 + 1/2) * 2 = (0,5+0,5)*2 = 1*2 = 2
7,2 - 1/8 * 24 = 7,2 -24/8 = 7,2-3 = 4,2
Zadanie 20 strona 54
a)1/2+0,6=0,5+0,6 = 1,1
0,55-1/4= 55/100 - 1/4 = 55/100 -25/100 = 30 /100 =3/10
1,25+5/6= 1 1/4 + 5/6 = 1 6/24 + 20 /24 = 1 26/24 = 2 2/24 = 2 1/12
b)5/4x0,1=5/4 * 1/10 = 1/8
1,2:3/5=12/10 * 5/3 = 4/2 = 2
0,25:1/8=1/4 * 8 = 2
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a) 2,5 + 2 * 1/2 =5/2 + 2/2 = 7/2 = 3,5
2,5 + 1 = 3,5
1,2 - (0,1+ 2/5) = 12/10 -(1/10 + 4/10)=12/10-5/10 = 7/10
0,4 * 1/4 + 7 = 4/10*1/4 + 7 = 1/10+7=7 1/10
4,4 : 4 + 1/4 = 44/10 *1/4 + 1/4 = 11/10 + 1/4 = 44/40 + 10 /40 = 54/40 = 1 7/20
b) 2/5 + (2 * 0,5) =2/5 + 1 = 1 2/5
2/3 * 6 : 1/4 = 4 * 4 = 16
( 0,5 + 1/2) * 2 = (0,5+0,5)*2 = 1*2 = 2
7,2 - 1/8 * 24 = 7,2 -24/8 = 7,2-3 = 4,2
Zadanie 20 strona 54
a)1/2+0,6=0,5+0,6 = 1,1
0,55-1/4= 55/100 - 1/4 = 55/100 -25/100 = 30 /100 =3/10
1,25+5/6= 1 1/4 + 5/6 = 1 6/24 + 20 /24 = 1 26/24 = 2 2/24 = 2 1/12
b)5/4x0,1=5/4 * 1/10 = 1/8
1,2:3/5=12/10 * 5/3 = 4/2 = 2
0,25:1/8=1/4 * 8 = 2