＝1.1×1.1×（1.1-1）-0.11＝1.1×1.1×0.1-0.11＝0.11×（1.1-1）＝0.11×0.1＝0.011
=(1.1×1.1)(1.1+1)-0.11=1.21×2.1-0.11=2.441-0.11=2.331
0.011
1
