求求求!①2/3(x-5)^2+5|m|=0②-2a^2乘b^(y+1)与3a^2b^3是同类项
求代数式0.375x²y+5m²x-｛-7/16x²y+[-1/4xy²+（3/16x²y-3.475xy）]-6.275xy²｝的值!