3+?=8,4+?=12,12+?=28
?-4=3,?-14=14,?-15=37
66-?=22,72-?=43,90-?=36
27+32=?,27+48=?,46+54=?
4*8=?,5*8=?,6*8=?
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?+24=75-41,?-22=16+16
14+?+34=72,33+23+13+3=?
12+?=23-?,17+32-16+13=?
?-21=?+21,100-35-12-38=?
举头望明月