(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=