这就是个移项问题
(1+0.23+0.34)X (0.23+0.34+0.56)-[ (1+0.23+0.34)X(0.23+0.34)+0.56X(0.23+0.34)]
=(1+0.23+0.34)X (0.23+0.34+0.56)-(1+0.23+0.34)X(0.23+0.34)-0.56X(0.23+0.34)
=(1+0.23+0.34)X (0.23+0.34+0.56-0.23-0.34)-0.56X(0.23+0.34)
=(1+0.23+0.34)X 0.56-0.56X(0.23+0.34)
=0.56