Question

Ex 8 va rog frumos dau coroana

Answer 1

Răspuns: Doar folosesti ordinea efectuarii operatiilor

Explicație pas cu pas:Avem a) x×3+47)

Answer 2

Explicație pas cu pas:a)(x×3+47)-315=146; (X×3+47)=146+315; X×3+47=461; X×3=461-47; X×3=414; X=414:3; X=138;  b) (X:6-528)+307=517; (X:6-528)=517-307; X:6-528=210; X:6=528+210; X:6=738; X738:6; X=123;  c)  (X:3-3)×9=30; (X:3-3)=306:9; X:3-3=34; X:3=34+3; X=37; X37×3; X=111;  d)  (X:2)×3=30×3; (X:2)×3=90; X:2=90:3; X:2=30; X=30×2; X=60;  e)  (7×9-X×5)-27:9=20; (63-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=9;  f)909:9-(9×9:x-9)=101; 909:9-(81:X-9)=101; 101-(81:X-9)=101;  (81:X-9)=101-101; 81:X-9=0; 81:X=9+0; 81:X=9; X=81:9; X=9;  g)  35×5-54:X×4=139; 175-54:X×4=139; 54:X×4=175-139; 54:X×4=36; 54:X=36:4; 54:x=9; X=54:9; X=6; h)  60-10:(37-4×X)=50;  50:(37-4×X)=50; (37-4×X)=50:50; 36-4×X=1; 4×X=37-1; 4×X=36; X=36×4;  X=144;   i)  81+9:9×(X+7)=101; 81+1×(X+7)=101; 81+X+7=101; X+88=101; X=101-88; X=13

Ultimul ex. nu este complet.

(rezolvat de iasmina clasa a 3a)