单项式-3x²减去单项式-4x²y,-5x²,2x²y的和,列算式为___,化简后的结果是____求具体内容,运算结果和过程,怎样做题

单项式-3x²减去单项式-4x²y,-5x²,2x²y的和,列算式为___,化简后的结果是____求具体内容,运算结果和过程,怎样做题
单项式-3x²减去单项式-4x²y,-5x²,2x²y的和,列算式为___,化简后的结果是____
求具体内容,运算结果和过程,怎样做题

单项式-3x²减去单项式-4x²y,-5x²,2x²y的和,列算式为___,化简后的结果是____求具体内容,运算结果和过程,怎样做题
算式是-3x²-[-4x²y+(-5x²)+2x²y]
-3x²-[-4x²y+(-5x²)+2x²y]
=-3x²+4x²y-(-5x²)-2x²y
=-3x²+4x²y+5x²-2x²y
=2x²+2x²y

列算式为：
-3x²-(-4x²y-5x²+2x²y)

化简后的结果是：2x²+2x²y


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