1:2分之3X的平方-{-2分之1X平方}+{-2X平方}.2:{9X平方-3+2X}+{-X-5+2X平方}
人气:128 ℃ 时间:2020-04-27 11:28:05
解答
1:2分之3X的平方-{-2分之1X平方}+{-2X平方}
=3x²/2+x²/2-2x²
=4x²/2-2x²
=2x²-2x²
=0
2:{9X平方-3+2X}+{-X-5+2X平方}
=9x²-3+2x-x-5+2x²
=11x²+x-8
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