Question

第一题：1.2除以0.25减去8.4除以2.5 第二题：1减去3分之1减去4分之1减去12分之1

Answer 1

1.2÷0.25-8.4÷2.5

=4.8-3.36

=1.44

1-1/3-1/4-1/12

=1-(1/3+1/4+1/12)

=1-(4/12+3/12+1/12)

=1-2/3

=1/3