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)
274 - 241 = 33
140 - 80 = 60
266 - 242 = 24
138 - 70 = 68
268 - 175 = 93
126 + 129 = 255
256 - 50 = 206
32 + 240 = 272
105 - 71 = 34
98 + 153 = 251
134 - 42 = 92
126 - 57 = 69
265 - 121 = 144
229 - 42 = 187
176 - 144 = 32
43 + 192 = 235
158 - 60 = 98
142 - 18 = 124
187 - 23 = 164
153 - 147 = 6
125 + 98 = 223
174 + 91 = 265
191 - 165 = 26
212 - 20 = 192
179 + 51 = 230
72 + 183 = 255
254 - 222 = 32
71 - 70 = 1
189 + 7 = 196
10 + 167 = 177
135 - 134 = 1
143 + 21 = 164
78 - 76 = 2
64 + 125 = 189
269 - 202 = 67
60 + 68 = 128
64 + 17 = 81
122 + 107 = 229
255 - 56 = 199
53 + 10 = 63
231 - 64 = 167
258 - 31 = 227
134 - 74 = 60
171 - 156 = 15
86 + 103 = 189
15 + 73 = 88
204 + 40 = 244
98 - 38 = 60
103 - 30 = 73
35 + 244 = 279
146 - 117 = 29
266 - 256 = 10
81 + 33 = 114
179 - 64 = 115
157 - 107 = 50
152 + 30 = 182
219 - 78 = 141
200 - 135 = 65
119 + 92 = 211
182 - 5 = 177
236 - 180 = 56
202 - 145 = 57
224 - 187 = 37
44 + 74 = 118
131 + 111 = 242
183 - 145 = 38
154 + 111 = 265
26 + 204 = 230
128 - 88 = 40
157 + 13 = 170
114 + 86 = 200
85 + 193 = 278
216 + 55 = 271
116 + 19 = 135
176 - 96 = 80
159 - 40 = 119
76 - 39 = 37
222 - 142 = 80
9 + 211 = 220
25 + 24 = 49
156 + 13 = 169
1 + 233 = 234
95 - 39 = 56
239 - 221 = 18
50 + 164 = 214
192 - 35 = 157
6 + 185 = 191
83 + 90 = 173
137 - 14 = 123
152 - 49 = 103
230 - 7 = 223
13 + 258 = 271
20 + 82 = 102
89 - 34 = 55
93 + 34 = 127
221 - 172 = 49
252 - 5 = 247
63 + 54 = 117
74 + 32 = 106
62 + 189 = 251