Question

Calculeaza numarul necunoscut :
(a x 5 ) :2=40:4
42:(d x 3 )=21:3


(b:3)x 6=52-4
60-(e x 9)=30:5


9 x (c:6)=6 x6
72-40=(f:3) x (40:5)


Multumesc ☺

Answer 1

(a x 5 ) :2=40:4

(a×5):2=10

a×5=10×2

a×5=20

a=20:5

a=4

42:(d x 3 )=21:3

42:(d×3)=7

d×3=42:7

d×3=6

d=6:3

d=2

(b:3)x 6=52-4

(b:3)×6=48

b:3=48:6

b:3=8

b=8×3

b=24

60-(e x 9)=30:5

60-(e×9)=6

e×9=60-6

e×9=54

e=54:9

e=6

9 x (c:6)=6 x6

9×(c:6)=36

c:6=36:9

c:6=4

c=4×6

c=24

72-40=(f:3) x (40:5)

32=(f:3)×8

f:3=32:8

f:3=4

f=4×3

f=12