56+37=93; 80-16=64; 31.5+5=36.5; 12-1.1=10.9;
1.2×0.2=0.24; 2.87÷0.7=4.1;
1
6 +
5
6 =1;
3
8 ×
4
5 =0.3;
30÷50=0.6 25×8=200;
1
4 +
1
5 =
9
20 ;
4
15 ÷
2
5 =
2
3 ;
12×
2
3 =8; 1÷
4
5 =1.25; 0×
7
8 =0;
1
3 ×2÷
1
3 ×2=4. 故答案依次为:93,64,36.5,10.9,0.24,4.1,1,0.3,,06,200,
9
20 ,
2
3 ,8,1.25,0,4.