6分之1+8分之3+8分之5-8分之1,
=1/6+1-1/8
=1+1/24
=1又1/24
2-(2分之1-4分之1),
=2-1/4
=1又1/4
10分之9-(5分之2+4分之1)
=9/10-13/20
=1/4
解答如下:
1.1/6+3/8+5/8-1/8 2. 2-(1/2-1/4) 3. 9/10-(2/5+1/4)
=(1/6-1/8)+(3/8+5/8) =2-1/2+1/4 =9/10-4/10-1/4
=1/24+1 =1又1/2+1/4 =5/10-1/4
=1又1/24 =1又 3/4 =1/4