已知多項(xiàng)式4x2m+1y-5x2y2-31x5y,
(1)求多項(xiàng)式中各項(xiàng)的系數(shù)和次數(shù).  
(2)若多項(xiàng)式是八次三項(xiàng)式,求m的值.
(1)4x2m+1y的系數(shù)是4,次數(shù)是2m+2;-5x2y2的系數(shù)是-5,次數(shù)是4;
-31x5y的系數(shù)是-31,次數(shù)是6;

(2)由(1)可得2m+2=8,解得m=3.
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