先化简,再求值：4m²-【6m-2（3m+2）-2m²】其中m=二分之一
问题描述：
先化简,再求值：4m²-【6m-2（3m+2）-2m²】其中m=二分之一
答
=4m^2 - (6m - 6m - 4 - 2m^2)
=4m^2 +4+2m^2
=6m^2 +4
=6/4+4
=5.5
答
4m²-【6m-2（3m+2）-2m²】
=4m²-【6m-6m+-4-2m²】
=4m²+4+2m²
=6m²+4
=6x(1/2)²+4
=3/2+4
=5.5