25*1/3*2/5*3/10
= (25*2/5)*(1/3*3/10)
= 10*1/10
= 1
或
= 25*2/5*3/10*1/3
=10*3/10*1/3
=1
或
=25*1*2*3/3*5*10
=5*5*1*2*3/3*5*2*5
=1
25*1/3*2/5*3/10
= (25*2/5)*(1/3*3/10)
= 10*1/10
= 1
或
= 25*2/5*3/10*1/3
=10*3/10*1/3
=1
或
=25*1*2*3/3*5*10
=5*5*1*2*3/3*5*2*5
=1