[-(4m+1)]²-4×2×(2m²-1)怎么算
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[-(4m+1)]²-4×2×(2m²-1)怎么算
[-(4m+1)]²-4×2×(2m²-1)怎么算
[-(4m+1)]²-4×2×(2m²-1)怎么算
=16m^2+8m+1-16m^2+8
=8m+9
因为负数的平方等于正数,(-a)^2=a^2
[-(4m+1)]^2
=(4m+1)^2
=16m^2+8m+1
原式=16m²+8m+1-16m²+8
=8m+9