Question

Calculați: 1) 1,25-0(3) +2, 1(6)
2) 2,0(3) -1, 8(3) -3, 0(6)
3) 2,75+0, 08(3) -1, (2)
4) 3,25-1,8(3) -3, 0(6)
5) -0, 02(7) -1, (6) +2, 125
6) -0, 69(4) +1, (6) -1, 875

Answer 1

1,25 - 0(3)+2,1(6)=1,25+1,8(3)=5/4 + 18/10 +6/900=1+1/4+1+4/5+2/300=
=2+ (75+240+2)/300=2+317/300=3+17/300=3+51/900=3,(51)


2,0(3)-1,8(3)-3,0(6)=0,2(3)-3,0(6)= -2,8(3)


2,75+0,08(3)-1,(2)=2,75 + 8/100+ 3/900-1-200/900=1,75+(72+3-200)/900=
=1,75 - 125/900=1+3/4 - 5/36=(36+27-5)/36=58/36=1+11/18=1,(55)


3,25-1,8(3)-3,0(6)=3,25 - 4,9= -1,65


-0,02(7)-1,(6)+2,125=2,125 -(1,(6)+0,02(7))=2,125 - 1,69(4)=0,431-4/9000
=(3879-4)/9000=3875/9000=0.430(5)


-0,69(4)+1,(6)-1,875=1,(6) - (0,69(4)+1,875)=1,(6) - 2,569(4)= 
= -0,903 +0,000(2)=(-8127+2)/9000= -8125/9000=-0,902(7)