День: 14 декабря 2021

753. Հաշվե՛ք

ա. 1/6+1/9=5/18

18:6=3

18:9=2

3+2=5

բ. 2/9+5/6=19/18                                                                                                                  

(18:9)x2=4

(18:6)x3=15

15+4=19

գ. 2/9+3/8=43/72

(72:9)x2=16

(72:8)x3=27

27+16=43

դ. 2/10+6/15=18/30

(30:10)x2=6

(30:15)x6=12

12+6=18

ե. 3/10+2/12=28/60

(60:10)x3=18

(60:12)x2=10

18+10=28

զ. 5/12+4/15=41/60

(60:12)x5=25

(60:15)x4=16

25+16=41

է. 3/4+5/18=37/36

(36:4)x3=27

(36:18)x5=10

27+10=37

ը. 2/26+3/39=12/78

(78:26)x2=6

(78:39)x3=6

6+6=12

թ. 7/34+5/17=17/34

(34:34)x7=7

(34:17)x5=10

10+7=17

ժ. 4/210+5/140=23/420

(420:210)x4=8

(420:140)x5=15

15+8=23

ի. 7/450+8/180=54/900

(900:450)x7=14

(900:180)x8=40

14+40=54

լ. 9/180+7/120=39/360

(360:180)x9=18

(360:120)x7=21

18+21=39

754. Հաշվե՛ք

ա. 1/4+4/7+9/28=32/28

(28:4)x1=7

(28:7)x4=16

(28:28)x9=9

7+16+9=32

բ. 1/5+3/10+7/20=17/20

(20:20)x7=7

(20:10)x3=6

(20:5)x1=4

7+6+4=17

գ. 3/20+7/30+2/40=52/120

(120:20)x3=18

(120:30)x7=28

(120:40)x2=6

18+28+6=52

դ. 17/20+23/30+11/60

(60:20)x17=51

(60:30)x23=46

(60:60)x11=11

51+46+11=108

ե. 3/20/+7/30+9/50=169/300

(300:50)x9=54

(300:30)x7=70

(300:20)x3=45

54+70+45=169

զ. 7/40+11/70+13/30=

(840:40)x7=147

(840:70)x11=132

(840:30)x13=104

147+132+104=383