7+?=8,5+?=13,16+?=28
?-2=7,?-19=19,?-15=23
45-?=21,44-?=18,80-?=32
24+26=?,38+44=?,92+15=?
4*4=?,1*5=?,2*5=?
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?+28=72-32,?-26=14+23
12+?+39=73,27+19+16+22=?
28+?=52-?,13+22+33-38=?
?-35=?+22,100-48-21-31=?
花落知多少