计算:4(m-1)^2+(2m+5)(5-2m)
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计算:4(m-1)^2+(2m+5)(5-2m)
计算:4(m-1)^2+(2m+5)(5-2m)
计算:4(m-1)^2+(2m+5)(5-2m)
4(m-1)^2+(2m+5)(5-2m)
=4(m-1)^2-(2m+5)(2m-5)
=4m^2-8m+4-(4m^2-25)
=-8m+29
4(m-1)^2+(2m+5)(5-2m)
=4m^2-8m+4+25-4m^2
=-8m+29
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