1. Oblicz:
1/2 * (0,8 + 1,2) =
5 * 0,2 + 3 0,4 =
1 - 0,2 * 0,3 =
3,6 : 1,2 - 1/2 =
3/4 + 3/4 * 1 1/3 =
2,5 - 1/2 * (2,6 - 1/5) =
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½×(0,8+1,2)=½×2=1
5×0,2+30,4=1+30,4=31,4
1-0,2×0,3=1-0,06=0,94
3,6:1,2-½=3-½=2½
¾+¾×1⅓=¾+¾×⁴/₃=¾+1=1¾
2,5-½×(2,6-⅕)=2,5-½×(2,6-0,2)=2,5-½×2,4=2,5-0,5×2,4=2,5-1,2=1,3
= 1/2 * 2 = 1
= 1 + 30,4 = 31,4
= 1 - 0,06 = 0,94
= 3 -1/2 =2 1/2
= 3/4 + 3/4 * 4/3 = 3/4 + 1 = 1 3/4
= 2,5 - 1/2 * ( 26/10 - 1/5) = 2,5 - 1/2 * (26/10 - 2/10)= 2,5 - 1/2 * 24/10 ====
2,5 - 12/10= 2,5 - 1 2/10= -1 3/10
:)