Question

计算题用简便方法计算

{45.6-（31.6+1.75）}×8.8

我算出前面的结果是12.25 这可怎么简算啊？

Answer 1

{45.6-（31.6+1.75）}×8.8
=(45.6-31.6-1.75)*8.8
=(14-1.75)*8.8
=12.25*8.8
=0.25*49*4*2.2
=(0.25*4)*(98*1.1)
=1*107.8
=107.8

Answer 2

答案是107.8
过程如下：
[45.6-（31.6+1.75）]×8.8
=[45.6-（31.6+1.4+0.35）]×8.8
=[45.6-（33+0.35）]×8.8
=（45.6-33.35）×8.8
=12.25×8.8
=12.25×(10-1.2)
=122.5-12.25×1.2
=122.5-[12.25（1+0.2）]
=122.5-12.25-2.45
=110.25-2.45
=107.8

Answer 3

[45.6-(31.6+1.75)]×8.8
=(45.6-31.6-1.75)×8.8
=(14-1.75)×8.8
=12.25×8×1.1
=9.8×1.25×8×1.1
=9.8×1.1×(8×1.25)
=9.8×1.1×10
=98×1.1
=98×(1+0.1)
=98×1+98×0.1
=98+9.8
=107.8

Answer 4

[45.6-(31.6+1.75)]×8.8
=(45.6-31.6-1.75)×8.8
=(14-1.75)×8.8
=12.25×8×1.1
=（12+0.25）×8×1.1
=（96+2）×1.1
=98×1.1
=98×(1+0.1)
=98×1+98×0.1
=98+9.8
=107.8

Answer 5

{45.6-（31.6+1.75）}*8.8
=[228/5-(158/5+7/4)]*(44/5)
=(228/5-667/20)*(44/5)
=[(912-667)/20]*(44/5)
=(245/20)*(44/5)
=49/5*11
=539/5
=107.8