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a fost răspuns

descopera varsta lui martisor , apoi incercuieste raspunsul corect
(y+10)*30/9+312=412 URGENT DAU VOT, COROANA SI MULTUMIRI VA ROG
+ 3 PUNCTE IN PLUS RASPUNSUL CORECT E 20 DAR IMI TREBUIE REZOLVARE CORECTA




Răspuns :

Cocirmariadenis

( y + 10 ) × 30 : 9 + 312 = 412

( y + 10 ) × 30 : 9 = 412 - 312

( y + 10 ) × 30 : 9 = 100

( y + 10 ) × 30 = 100 x 9

( y + 10 ) × 30 = 900

y + 10 = 900 : 30

y + 10 = 30

y = 30 - 10

y = 20

(Y+10)×30÷9+312=412
(Y+10)×30÷9=412-312
(Y+10)×30÷9=100
(Y+10)×30=100×9
(Y+10)×30=900
(Y+10)=900÷30
(Y+10)=30
Y+10=30
Y=30-10
Y=20

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