点击浏览该文件120+90=                                

                                 148+37=

                                 54+97=

                                 350+470=

                                 32+268=

199+76=

12+18+14=

25+67+75=

46+49+51=

84+27+73=

100-43=

420-150=

200-82=

175-56=

151-99=

323-197=

760-403=

174-48-52=

416-216-78=

520-145-65=