Question

1减0.12加2分之1减0.34加3分之1减0.56加5分之1减0.78

Answer 1

1-0.12+1/2-0.34+1/3-0.56+1/5-0.78

=1+1/2+1/3+1/5 -(0.12+0.78+0.34+0.56)

=1+1/2+1/3+1/5 -(0.12+0.78+0.34+0.56)

=1.7+1/3-(0.9+0.9)

=1/3-0.1

=1/3-1/10

=7/30