session commit的作用:1x+2y+3x+……100y=?
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????
50x+51y
楼上的..你错了诶..
原式=X(1+3+5+7+……+99)+Y(2+4+6+8+……+100)
=X[(1+99)*50/2]+Y[(2+100)*50/2]
后面自己算..
1x+2y+3x+……100y=?
(x-y)^2×(y-x)^3=???
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