6.9-6=        0.9+0.6=      1-0.09=         0.9+0.1=

2.7+2.2=      0.2+0.8=      0.7-0.7=        5.5+11=

1.3-0=        9.7-7=        0.93+0.73=      13.8-0.8=

0.6+2.7=      5.4+0.3=      0.65+0.35=       0.8+8=

9.8+6.52=                      23.4-9.4+0.6=        

7－4.68=                        20.9－（3.7－2.7）=

8.5+5.5-5.5=                100－15×2=

13－5.42－2.58=           90÷3×3=

3.27+5.86=

6.3-3.6=

7.63+2.38=  29.71-4.35=

①3.40+2.01

②40.4-3.50

③1.10+6.80

3.5-2.6= 5.8+3.43=

*8.53-7.24=   *12.01+9.98=