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Cine ma ajuta la aceste exercitii va rog: 1)(x:3-3)×9=906 2)(7×9-x×5)-9:3=20

Răspuns :

1)(x:3-3)x9=306
x:3-3=306:9
x:3-3=34
x:3=34+3
x:3=37
x=37x3
x=111

(7x9-x*5)-9:3=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