﹙2分之1+3分之1﹚÷5分之2-4分之3
=(1/2+1/3)÷2/5-3/4
=(3/6+2/6)x5/2-3/4
=5/6x5/2-3/4
=25/12-9/12
=16/12
=4/3
0.1×99 99×99 99分之98
=9999x98/9999x0.1
=98x0.1
=9.8
﹙2分之1+3分之1﹚÷5分之2-4分之3
=(1/2+1/3)÷2/5-3/4
=(3/6+2/6)x5/2-3/4
=5/6x5/2-3/4
=25/12-9/12
=16/12
=4/3
0.1×99 99×99 99分之98
=9999x98/9999x0.1
=98x0.1
=9.8