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calculati (x:2)×3=30×3 (7×9-x×5)-27:9=20​

Răspuns :

(x:2)×3=30×3

(x:2)×3=90

x:2=90:3

x:2=30

x=30×2

x=60

(7×9-x×5)-27:9=20

(63-x×5)-3=20

63-x×5=20+3

63-x×5=23

x×5=63-23

x×5=40

x=40:5

x=8

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