(6.8-6.80.55)8.5=
0.12 4.80.124.8=
（3.21.5+2.5）1.6=
3.2（1.5+2.5）1.6=
6-1.64=
5.38+7.85-5.37=
7.20.8-1.25=
6-1.193-0.43=
6.5（4.8-1.24）=
0.681.9+0.321.9=
10.15-10.750.4-5.7=
5.8（3.87-0.13）+4.23.74=
32.52-（6+9.7283.2）2.5=
（7.1-5.6）0.9-1.15] 2.5
5.4[2.6（3.7-2.9）+0.62]=
126（12-7.2）-6=
1267.2-6=
0.6（1.7－0.9）0.24+1.25=(6.8-6.80.55)8.5=
5.4[（2.73＋1.85）2.29]-3.56=
0.12 4.80.124.8=
（3.21.5+2.5）1.6=
3.2（1.5+2.5）1.6=
6-1.64=
5.38+7.85-5.37=
7.20.8-1.25=
6-1.193-0.43=
6.5（4.8-1.24）=
0.681.9+0.321.9=
10.15-10.750.4-5.7=
5.8（3.87-0.13）+4.23.74=
32.52-（6+9.7283.2）2.5=
[（7.1-5.6）0.9-1.15] 2.5=
5.4[2.6（3.7-2.9）+0.62]=
126（12-7.2）-6 =
1267.2-6=