15．直接写得数．
0 157947 157955 157961 157965 157971 157973 157977 157983 157985 157991 157997 158001 158003 158007 158013 158015 158021 158025 158027 158031 158033 158037 158039 158041 158042 158043 158045 158046 158047 158049 158051 158055 158057 158061 158063 158067 158073 158075 158081 158085 158087 158091 158097 158103 158105 158111 158115 158117 158123 158127 158133 158141 199269
| 3.8+0.12= | 1-0.9= | 0.96-0.7= | 0.09×100= |
| 0.2×36= | 0.45×2= | 4×0.25= | 3.26÷100= |