算式是-3x²-[-4x²y+(-5x²)+2x²y]
-3x²-[-4x²y+(-5x²)+2x²y]
=-3x²+4x²y-(-5x²)-2x²y
=-3x²+4x²y+5x²-2x²y
=2x²+2x²y
单项式-3x²减去单项式-4x²y,-5x²,2x²y的和,列算式为___,化简
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