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____
问题描述:
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
答
算式是-3x²-[-4x²y+(-5x²)+2x²y]-3x²-[-4x²y+(-5x²)+2x²y]=-3x²+4x²y-(-5x²)-2x²y=-3x²+4x²y+5x²-2x²y=2x²+2x²y