25又6分之5*0.4
=25x0.4+5/6x0.4
=10+1/3
=10又1/3
0.4=4/10=2/5
999又999分之998×999
=(1000-1/999)x999
=1000x999-1/999x999
=999000-1
=998999
4÷[5+(1-3分之2*0.6)÷3]
=4÷[5+(1-2/3X3/5)÷3]
=4÷(5+3/5÷3)
=4÷26/5
=10/13
25又6分之5*0.4
=25x0.4+5/6x0.4
=10+1/3
=10又1/3
0.4=4/10=2/5
999又999分之998×999
=(1000-1/999)x999
=1000x999-1/999x999
=999000-1
=998999
4÷[5+(1-3分之2*0.6)÷3]
=4÷[5+(1-2/3X3/5)÷3]
=4÷(5+3/5÷3)
=4÷26/5
=10/13