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Afla numărul necunoscut:a). (y:2)X3=10x3 b). (7x9-bx5)-9:3=20. c) 60-10:(37-4ori x)=50. d)20x10x30x40xa=0

Răspuns :

a)(y:2)×3=10×3

(y:2)×3=30

(y:2)=30:3

y:2=10

y=10:2

y=5

b)(7×9-b×5)-9:3=20

(63-b×5)-3=20

(63-b×5)=20+3

63-b×5=23

b×5=63-23

b×5=40

b=40:5

b=8

c)60-10:(37-4×X)=50

10:(37-4×X)=60+50

10:(37-4×X)=110

(37-4×X)=110:10

37-4×X=11

4×X=37+11

4xX=48

X=48:4

X=12

d)20×10×30×40×a=0

a=0

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