Ordinea efectuării operațiilor cu numere zecimale
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Ordinea efectuării operaţiilor Ordinea efectuării operaţiilor cu numere zecimale. cu numere zecimale. Autor:profesor Pop Peter Şcoala cu clasele I-VIII nr. 1 Negreşti-Oaş
Transcript of Ordinea efectuării operațiilor cu numere zecimale
Ordinea efectuării operaţiilor Ordinea efectuării operaţiilor cu numere zecimale.cu numere zecimale.
Autor:profesor Pop PeterŞcoala cu clasele I-VIII nr. 1
Negreşti-Oaş
Exerciţiul 1Exerciţiul 1 Efectuaţi: a) 20+1,7-6,3= Rezolvare: 20+1,7-6,30=21,7-6,30=15,4 b) 5,8-2,9+0,37= Rezolvare: 5,8-2,9+0,37=2,9+0,37=3,27 c) 9,29+2,71-5,4-2,2= Rezolvare: 9,29+2,71-5,4-2,2= =12-5,4-2,2= =6,6-2,2=4,4
-continuare--continuare- d) 15,24:10:100=
Rezolvare: 15,24:10:100=
=1,524:100=
=0,01524 e) 8,24∙10:2=
Rezolvare: 8,24∙10:2=82,4:2=41,2 f) 32,45:5∙20=
Rezolvare: 32,45:5∙20=6,49∙20=129,80
--continuare-continuare- g) 3,5∙10-27,3=
Rezolvare: 3,5∙10-27,3= 35-27,3=7,7 h) 4,53∙100-2,7∙23=
Rezolvare: 4,53∙100-2,7∙23=453-2,7∙23=453-62,1=
=390,9 i) 20-0,47∙5=
Rezolvare: 20-0,47∙5=20-2,35=17,65
Alte exerciţii propuse:
3-2·0,9=
Rezolvare: 3-2·0,9=3-1,8=1,2 2,5·10-34:10=
Rezolvare: 2,5·10-34:10=25-3,4=21,6 (5,6+4,4):100=
Rezolvare: (5,6+4,4):100=10:100=0,1 2,55:3+3:100=
Rezolvare: 2,55:3+3:100=0,85+0,03=0,88 1,44:144+0,26=
Rezolvare: 1,44:144+0,26=0,01+0,26=0,27
-continuare-
[(6,5+3·1,5):10+0,9]:10+0,8= Rezolvare: [(6,5+3·1,5):10+0,9]:10+0,8= =[(6,5+4,5):10+0,9]:10+0,8= =(11:10+0,9):10+0,8= =(1,1+0,9):10+0,8= =2:10+0,8=0,2+0,8=1 [(10-3,4:2)·10-3]:1000+1= Rezolvare: [(10-3,4:2)·10-3]:1000+1= =[(10-1,7)·10-3]:1000+1= =(8,3·10-3):1000+1= =(83-3):1000+1=80:1000+1=0,08+1=1,08
-continuare-
(26:40+3,35)·(16:20+2,2)= Rezolvare: (26:40+3,35)·(16:20+2,2)= =(0,65+3,35)·(16:20+2,2)= =4·(16:20+2,2)= =4·(0,8+2,2)= =4·3=12 (28:80+6,65)·(18:60+7,7)= Rezolvare: (28:80+6,65)·(18:60+7,7)= =(0,35+6,65)·(18:60+7,7)= =7·(18:60+7,7)= =7·(0,3+7,7)= =7·8=56
-continuare-
(22:40+4,45)∙(12:40+7,7)=
Rezolvare: (22:40+4,45)∙(12:40+7,7)=
=(0,55+4,45)∙(12:40+7,7)=
=5∙(12:40+7,7)=
=5∙(0,3+7,7)=
=5∙8=40 (32:50+3,36)∙(24:60+6,6)=
Rezolvare: (32:50+3,36)∙(24:60+6,6)=
=(0,64+3,36)∙(24:60+6,6)=
=4∙(24:60+6,6)=
=4∙(0,4+6,6)=
=4∙7=28
v
-continuare-
(18:40+5,55)∙(28:40+3,3)=
Rezolvare: (18:40+5,55)∙(28:40+3,3)=
=(0,45+5,55)∙(28:40+3,3)=
=6∙(28:40+3,3)=
=6∙(0,7+3,3)=
=6∙4=24 (26:50+4,48)∙(12:30+6,6)=
Rezolvare: (26:50+4,48)∙(12:30+6,6)=
=(0,52+4,48)∙(12:30+6,6)=
=5∙(12:30+6,6)=
=5∙(0,4+6,6)=
=5∙7=35
-continuare-
(18:40+5,55)∙(28:40+3,3)=
Rezolvare: (18:40+5,55)∙(28:40+3,3)=
=(0,45+5,55)∙(28:40+3,3)=
=6∙(28:40+3,3)=
=6∙(0,7+3,3)=
=6∙4=24 (26:50+4,48)∙(12:30+6,6)=
Rezolvare: (26:50+4,48)∙(12:30+6,6)=
=(0,52+4,48)∙(12:30+6,6)=
=5∙(12:30+6,6)=
=5∙(0,4+6,6)=
=5∙7=35
