142-69=73, 0.56÷8=0.07, 4.1+1÷2=4.6, 0.6×0.6=0.36,
5.4+9=14.4, 3-
1
6 -
5
6 =2, 6.4+3
3
5 =10,
7 ×
2
5 ×5×7=6.