Răspuns:
a) [(x+540:6)•7-100]=30•20
[(x+540:6)•7-100]=600
[(x+540:6)•7]=600+100
[(x+540:6)•7]=700
(x+540:6)=700:7
(x+540:6)=100
(x+540)=100•6
x=600-540
x=60
b)(x•9-78•2)+4•25=1492
(x•9-156)+100=1492
(x•9-156)=1492:100
(x•9)=14,92
x=14,92:9
x=..... nu îmi iese nu știu dc vezi tu la ce am greșit
c)[(72:a-3•4)•36-19•5]-(124•6-301•2)=195
[(72:a-3•4)•36-95]-(744-602)=195
[(72:a-3•4)•36-95]-142=195
[(72:a-3•4)•36-95]=195+142
(72:a-3•4•36-95)=337
(72:a-12•36-95)=337
(72:a-432-95)=337
(72:a-337)=337
72:a=337+337
72:a=674
a=674•72
a=48.528
