分数四则混合运算计算练习题怎样简便就怎样计算:51÷(1-31×21)109×【87÷(54+41)】(41-41×21)÷4165+89×95×989×65+65÷91(83+271)×8+2719X-31X=321-31X=328X+31=974415:X=11584×(43-31)83+(73+141)×321211÷81+1213×8(43-43×65)÷344-(51+31)×4352÷(52+52×43)(41-41×99)÷242574×98+73×98(16×83+4)÷72143×32÷43×3297×(1÷87+78÷1)54×【(21-51)÷158】5034×74-74×50943×5687+4481×43-43(43+232)×8+23721×3+5×213×(152+121)-5231+3-(41+121)43×75×34-211615+(167-41)÷2132+(74+21)×25741+2X=215X-65=12532X-51X=1X+97X=34一、准确计算:65+35×5485-41×(98÷32)(21-61)×53÷5161÷【179×(43+32)】1211-41+103÷5332÷【(43-21)×54】52+154-5276×85+83÷67(117-83)×8813—48×(121+161)54÷3+32×5452+21×53+1071312×73+74×1312+1312(87-165)×(95+32)138÷7+71×136【1-(41+83)】÷4197÷511+92×115(61+43-32)×122-136÷269-3299×1009921÷85+41×5343×52+41÷252110×207÷65-4145×4443(83-41)÷8383÷(83-41)65×4-(87+32)5-87-0,12530×(52