作业帮4x²-{-3x²-[5x-x²-(2x²-x)]+4x},其中x=½
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/23 19:55:29
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4x²-{-3x²-[5x-x²-(2x²-x)]+4x},其中x=½
4x²-{-3x²-[5x-x²-(2x²-x)]+4x},其中x=½
4x²-{-3x²-[5x-x²-(2x²-x)]+4x},其中x=½
4x²-{-3x²-[5x-x²-(2x²-x)]+4x}
=4x²-[-3x²-(5x-x²-2x²+x)+4x]
=4x²-(-3x²-5x+x²+2x²-x+4x)
=4x²-(-2x)
=4x²+2x
=2x(2x+1)
当x=½ 时
原式=2
当x=½ 时
4x²-{-3x²-[5x-x²-(2x²-x)]+4x}=4x²+3x²+5x-x²-2x²+x-4x=4x²+6x
=4×(1/2)²+6×1/2=1+3=4