270+383=?,369+476=?,690+718=?
520-78=?,857-367=?,978-209=?
27+?=628,446+?=783,222+?=985
73*7=?,6*107=?,836*4=?
255/3=?,696/8=?,702/9=?
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?-239=833-302,165+252+332+204=?
795-304=?+272,413+382+220-922=?
285+?+234=906,501+276-374-349=?
421+?-614=442,999-180-312-415=?
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