280以内加减法，链接后加“?x=300”可调整加大计算数值，最大300。点此切换答案显示，方便截图打印。
注：改变浏览窗口大小，可调整每行题数，本页默认会显示100道，刷新页面随机重排。黑海豚设计（交流QQ:6932391)
185 + 89 = 274
251 - 127 = 124
259 - 44 = 215
148 - 140 = 8
261 - 33 = 228
246 - 91 = 155
199 + 12 = 211
259 - 148 = 111
122 - 31 = 91
182 + 44 = 226
231 + 5 = 236
190 - 2 = 188
277 - 242 = 35
158 - 78 = 80
84 + 167 = 251
258 - 74 = 184
166 - 52 = 114
82 + 57 = 139
120 - 37 = 83
277 - 100 = 177
208 - 185 = 23
162 - 22 = 140
201 + 56 = 257
209 - 54 = 155
272 - 106 = 166
72 + 80 = 152
123 + 73 = 196
17 + 80 = 97
198 - 20 = 178
201 - 102 = 99
123 + 146 = 269
50 + 128 = 178
78 + 167 = 245
11 + 59 = 70
169 + 75 = 244
217 - 166 = 51
227 - 91 = 136
205 + 48 = 253
9 + 93 = 102
77 + 5 = 82
229 + 6 = 235
163 + 91 = 254
95 + 51 = 146
12 + 50 = 62
20 + 190 = 210
268 - 37 = 231
262 - 160 = 102
152 - 122 = 30
199 + 71 = 270
269 - 263 = 6
148 + 79 = 227
220 + 57 = 277
130 + 106 = 236
26 + 16 = 42
238 + 31 = 269
201 - 174 = 27
248 - 3 = 245
75 + 120 = 195
248 - 126 = 122
199 - 95 = 104
6 + 241 = 247
8 + 9 = 17
18 + 42 = 60
124 - 80 = 44
21 - 20 = 1
17 + 199 = 216
151 - 138 = 13
210 - 5 = 205
132 + 117 = 249
122 + 72 = 194
171 + 17 = 188
40 + 76 = 116
110 - 100 = 10
135 + 48 = 183
45 - 22 = 23
43 - 39 = 4
241 - 68 = 173
275 - 6 = 269
191 - 163 = 28
40 + 122 = 162
232 - 3 = 229
174 + 23 = 197
129 - 92 = 37
120 - 9 = 111
61 + 109 = 170
110 + 155 = 265
170 + 110 = 280
263 - 31 = 232
238 - 61 = 177
57 + 180 = 237
179 + 70 = 249
103 + 143 = 246
278 - 82 = 196
85 - 32 = 53
193 - 18 = 175
79 - 44 = 35
102 + 111 = 213
202 - 41 = 161
142 + 5 = 147
140 + 66 = 206