Question

A=12,(4)+11,(5)+5,(13)+2,(75)+0,(1) si B=1,(1)+2,(2)+3,(3)+4,(4)+5,(5)+6,(6)+7,(7)+8,(8) Calculati 40×A+18×B+20​

Answer 1

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: