452+343=?,285+425=?,433+790=?
701-60=?,978-664=?,947-137=?
27+?=878,240+?=753,361+?=934
68*7=?,42*9=?,307*4=?
432/8=?,590/5=?,834/6=?
---
?-278=810-478,141+197+486+137=?
703-239=?+361,565+308+288-976=?
294+?+366=985,489+467-280-326=?
277+?-501=466,999-202-152-462=?
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