12分之7*11+12分之7
=7/12x(11+1)
=7/12x12
=7
8分之7*49分滚晌之3*9分之8
=7/8x8/9x3/49
=7/9x3/49
=1/21
35*(4分之大困锋1+3分之1)
=(36-1)x(3/12+4/12)
=36x7/12-1x7/尺毕12
=21-7/12
=20又5/12
12分之7*11+12分之7
=7/12(11+1)
=7/12X12
=7
8分之7*49分裤陆之3*9分胡滑顷让做之8
=1/21(约分)
35*(4分之1+3分之1)
=35X(3/12+4/12)
=35X 7/12
=245/12
你打得累,我看得也累