是的,有簡(jiǎn)便算法.
（1）1.25×1.25×┄×1.25×0.8×0.8×┄×0.8
= (1.25×0.8）×┄×(1.25×0.8）×0.8
12個(gè)(1.25×0.8） 1個(gè)0.8
= 1×┄×1×0.8
=0.8
（2）31.6×7.6+184×0.77
= 316×0.76 + 184×(0.76+0.01)
= (316+184)×0.76 + 184×0.01
= 500×0.76 + 1.84
= 380 + 1.84
= 381.84
（3）(6+43+473+5414+43444) ×2.5
= [(6+5414)+(43+473)+43444]×2.5
= (5420+516+43444)×2.5
= (5420/4+516/4+43444/4)×4×2.5
= (1355+129+10861)×10
= 123450
最后這題我沒(méi)有想到特別簡(jiǎn)便的方法,基本上是硬算了.