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81)

ա)
2:1=x:8 x=16

բ)
6:2=x/8 x=24

գ)
2:22=x:8 x=16/22

դ)
5:4=x:8 x=10

82)

ա)
x/4=8/3 x=8×4:3 x=32/3

բ)
7/x=9/5 x=7×5:9 x=35/9

գ)
6/17=x/3 x=6×3:17 x=18/17

դ)
25/7=15/x x=7×15:25 x=105/25 = 21/5


83)

Ճանապարհի 3/4-ը = 6/ժ
x/ժ = 4/4

x=6:3=2 2×4=8

x=8/ժ

85)
500/77=300/x

x=300×77:500

300×77=23100

23100:500=23100/500

x=23100/500=231/5

88)
160/8=56/x

x=160xX=8×56 448:160 = 448/160

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