231-231=
0+178=
0÷108=
196×0=
45×11=
144÷12=
77÷77=
243+243=
630÷30=
390-159=
0.103×100=
3.5+1.1=
15.6-11.2=
0.6×0.8=
16.36+12.33=
8.99-2.5=
135×22= 540÷5= 369÷9=
0.2×100=
15÷1000=
880÷40=
169+89-69=
25×4÷25×4=
40-40÷40=
7.4×1000÷100=
78÷78+78=
0.35+0.75= 2-0.8= 0.41×1000= 5×0.2=
2.4×5= 2.4-1.4= 0.25×0.4= 12.5×0.8=
77﹣23= 19+799×0= 25×9×4= 7.08×10= 0×250÷5=
45÷(3×5)= 4.56÷10= 52÷1000= 3.05×100÷1000= 8×5÷8×5=
4.8+2=
13.4-8=
2.4+0.61=
0.84-0.48=
5.3+7.7=
3.2-2=
1-0.03=
2.38+0.7=
0.35+1.65=
6.8-1.2=
①;
②。