（4除2/5+5)X2/3 (1/4+1/6+1/3)X24 7/31除5/2+3/5X7/31 （100减1456除26)X78 7/25X101减7/25
(4除2/5+5)X2/3 =(4×5/2+5)×2/3=15×2/3=10
(1/4+1/6+1/3)X24=1/4X24+1/6X24+1/3X24=6+4+8=18
7/31除5/2+3/5X7/31=7/31X2/5+3/5X7/31=7/31X(2/5+3/5)=7/31
(100减1456除26)X78=100X78-1456/26X78=7800-1456X3=3432
7/25X101减7/25=7/25X(101-1)=7/25X100=28追问
(1/4+1/6+1/3)X24=1/4X24+1/6X24+1/3X24=6+4+8=18
7/31除5/2+3/5X7/31=7/31X2/5+3/5X7/31=7/31X(2/5+3/5)=7/31
(100减1456除26)X78=100X78-1456/26X78=7800-1456X3=3432
7/25X101减7/25=7/25X(101-1)=7/25X100=28追问
对吗？错了要罚的
追答对的
追问｛1/6减（5/14减1/3）｝X7/9
追答没错！
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