2+?=6,4+?=13,25+?=78
?-2=6,?-13=23,?-27=73
83-?=37,74-?=57,102-?=66
24+44=?,28+57=?,45+63=?
6*7=?,4*8=?,3*9=?
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?+33=97-23,?-18=19+44
23+?+43=99,5+16+27+38=?
21+?=69-?,52+37-43-44=?
?-42=?+28,100-47-32-13=?
牙齿地包天