脱式计算,六个题,6个脱式计算,1.【（九分之八加一又三分之一）乘四分之三减零点二五】除十二分之一2.三又十四分之四乘（

1.【（九分之八加一又三分之一）乘四分之三减零点二五】除十二分之一
(1/12)/((8/9+1又(1/3))*(3/4)-0.25)
=(1/12)/((8/9+4/3)*(3/4)-0.25)
=(1/12)/((16/9)*(3/4)-0.25)
=(1/12)/(4/3-1/4)
=(1/12)/(16/12-3/12)
=(1/12)/(13/12)
=1/13
2.三又十四分之四乘（七分之五减十四分之三除四分之三）
3又(4/14)*(5/7-(3/4)/(3/14))
=(46/14)*(5/7-7/2)
=(46/14)*(10/14-49/14)
=(23/7)*(-39/14)
=-897/98
=-9又(15/98)
3.七分之三除十一分之七加七分之四除十一分之七
(7/11)/(3/7)+(7/11)/(4/7)
=(49/33)+(49/44)
=(49/11)*(1/3+1/4)
=(49/11)*(4/12+3/12)
=(49/11)*(7/12)
=343/132
4.八又四分之三减零点三五加（一点二五减六又二十分之十三）
8又(3/4)-0.35+(1.25-6又(13/29))
=(35/4)-(35/100)+((125/100)-(187/29))
=(35/4)-(7/20)+((25/20)-(187/29))
=(175/20)-(7/20)+((725/580)-(3740/580))
=(168/20)-(3015/580)
=(4872/580)-(3015/580)
=1857/580
=3又(117/580)
5.两千一百乘两千分之两千一百
2100*(2100/2000)
=2100*(21/20)
=210*(21/2)
=105*21
=2205
6.二十七分之四乘五十五分之九乘二百四十三乘一百六十五
(4/27)*(9/55)*243*165
=4*9*9*3
=972