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stiind ca:
3 ori x - 5=550
100+2 ori y =1640
(z-1) ori 7+10=150
aflati numerele x,y si z si apoi calculati (x+y-1):z=


Răspuns :

a)3x-5=550
3x=555
=>x= 555/3=>x= 185
b)100+2y=1640
2y=1540
=>y=1540/2
=>y=770
c) (z-1)×7+10=150
7z-7+10=150
7z=7-10+150
7z=147
z=147/7
z=21

d)

(x+y-1):x
(185+770-1):21=
954:21=