15．直接写出得数．
0 161081 161089 161095 161099 161105 161107 161111 161117 161119 161125 161131 161135 161137 161141 161147 161149 161155 161159 161161 161165 161167 161171 161173 161175 161176 161177 161179 161180 161181 161183 161185 161189 161191 161195 161197 161201 161207 161209 161215 161219 161221 161225 161231 161237 161239 161245 161249 161251 161257 161261 161267 161275 199269
| 3.8+6.2= | 3.2-2.3= | 0.15×1000= | 225÷9= | 48÷8×9= |
| 0.3÷10= | 12×50= | 25×4÷25= | 2.6+3.7+7.4= | 125÷25×7= |