w+w+s+s+s+s+s=56 s+s+s+s+s+s+w+w+w=75 w+w+s+s+x=45 w= s= x=

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w+w+s+s+s+s+s=56 s+s+s+s+s+s+w+w+w=75 w+w+s+s+x=45 w= s= x=
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w+w+s+s+s+s+s=56 s+s+s+s+s+s+w+w+w=75 w+w+s+s+x=45 w= s= x=
w+w+s+s+s+s+s=56 s+s+s+s+s+s+w+w+w=75 w+w+s+s+x=45 w= s= x=

w+w+s+s+s+s+s=56 s+s+s+s+s+s+w+w+w=75 w+w+s+s+x=45 w= s= x=
w+w+s+s+s+s+s=56 -----------------(1)
s+s+s+s+s+s+w+w+w=75 ----------(2)
w+w+s+s+x=45 -------------------------(3)
(2)-(1) 得:s+w=19 ---------------------(4)
则:  s+s+w+w=38 ------------------(5)
(1)-(5) 得: s+s+s=56-38=18, s=6
w=19-s=19-6=13
(3)-(5) 得: x=45-38=7
w=13
s=6
x=7