Răspuns:
A=12,(4)+11,(5)+5,(13)+2,(75)+0,(1)
A= 112/9+104/9+508/99+273/99+1/9
A= 217/9+ 781/99
A= 217/9+ 71/9
A= 288/9
A= 32
B=1,(1)+2,(2)+3,(3)+4,(4)+5,(5)+6,(6)+7,
(7)+8,(8)
B=10/9+20/9+30/9+40/9+50/9+
60/9+70/9+80/9
B=(10+20+30+40+50+60+70+80)/9
B= 360/9
B= 40
40×A+18×B+20=
40×32+18×40+20=
1280+ 720+20=
2020
Explicație pas cu pas:
