可以这么做——
(1.23+2.34+3.41+4.12)*11
=[(1+0.23+2+0.34+3+0.41+4+0.12)]*11
=[(1+2+3+4)+(0.23+0.34+0.41+0.12)]*11
=(10+1.1)*11
=10*11+1.1*11
=110+12.1
=122.1
可以这么做——
(1.23+2.34+3.41+4.12)*11
=[(1+0.23+2+0.34+3+0.41+4+0.12)]*11
=[(1+2+3+4)+(0.23+0.34+0.41+0.12)]*11
=(10+1.1)*11
=10*11+1.1*11
=110+12.1
=122.1