Question

Dacă x=2,3(7)+2,08(3)și 4,2(5)-3,2(4), atunci numărul x÷Y este cuprins intre:

Answer 1

x=2,3(7)+2,08(3)=(237-23)/90+(2083-208)/900=214/90+1875/900=
=(2140+1875)/900=4015/900=803/180=4,46(1)
y=4,2(5)-3,2(4)=(425-42)/90-(324-32)/90=383/90-292/90=91/90=1,0(1)
x:y=(803/180 ) / (91/90)=803/180  × 90/91=803/(2×91)=803/182=
=4,4(120879)
este cuprins intre 4,41 si 4,42