已知|m+2|+(n-3）^2=0,求代数式3m^2n-mn^2+5和的值
满足 m+2 = 0 n-3 = 0
m = -2 n= 3
3m^2n-mn^2+5
= mn ( 3m - n ) + 5
= -6 x ( -6 -3 ) + 5
= 6 x 9 + 5
= 54 + 5
= 59
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