单项式-3x²依次减去单项式-4x²y,-5x²,2x²y的差为多少/?//

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单项式-3x²依次减去单项式-4x²y,-5x²,2x²y的差为多少/?//

单项式-3x²依次减去单项式-4x²y,-5x²,2x²y的差为多少/?//
单项式-3x²依次减去单项式-4x²y,-5x²,2x²y的差为多少/?//

单项式-3x²依次减去单项式-4x²y,-5x²,2x²y的差为多少/?//
2x²+2x²y

-3x²-(-4x²y)-(-5x²)-2x²y
=-3x²+4x²y+5x²-2x²y
=2x²+2x²y
=2x²(y+1)

-3x^2+4x^2y,2x^2,-3x^2-2x^2y