（1+0.12+0.23）X(0.12+0.23+0.34) - (1+0.12+0.23+0.34)X(0.12+0.23)
=（0.12+0.23+0.34）+（0.12+0.23）×(0.12+0.23+0.34) - (0.12+0.23)-(0.12+0.23+0.34)×（0.12+0.23）
=(0.12+0.23+0.34) - (0.12+0.23)
=0.34请问是不是简便啊？ 我怎么看都不像啊呵呵