210+546=?,201+507=?,437+667=?
723-71=?,801-204=?,831-326=?
14+?=809,289+?=877,374+?=957
85*6=?,74*8=?,108*6=?
96/3=?,84/6=?,168/4=?
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?-251=728-432,143+234+310+176=?
895-239=?+370,335+250+276-638=?
211+?+374=925,407+293-115-388=?
246+?-422=357,999-318-178-373=?
做困难算术