(3m-2)x^2×y^(n-1)是关于xy的系数为1的六次单项式
3m-2=1
2+(n-1)=6
m=1,n=5
(1)
m-2×n^2=1-2*5^2=-49
(2)
(m-2)*n^2=(1-2)*5^2=-25