Răspuns:
ex.22 "A", ex.23 a=289, a=9, r=227
Explicație pas cu pas:
ex. 22:
y×2=(7-4÷4)×3=(7-1)×3=6×3=18
y=18÷2=9
z×6=16÷4×2-0×99+3×3+1=8+9+1=18
z=18÷6=3
y=3×z=3×3=9
ex. 23:
194×3+200-a=493
582-a=493-200
582-a=293
-a=293-582= -289
a=289
(104×4+83×5)-a×3=8×100+36÷9
416+415-a×3=804
-a×3=804-831= -27
-a= -27÷3= -9
a=9
(138×5-21÷7-300×2)-9×9-r×2=2
(690-3-150)-81-r×2=2
537-81-r×2=2
-81-r×2=2-537= -535
-r×2= -535+81= -454
-r= -454÷2= -227
r=227
