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3x^2-[5x-(2/1x-3)+2x^2]=
人气:413 ℃ 时间:2020-04-09 12:35:35
解答
3x²-[5x-(1/2x-3)+2x²]
=3x²-[5x-1/2 x+3+2x²]
=3x²-(2x²+9/2 x+3)
=3x²-2x²-9/2 x-3
=x²-9/2x-3
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