合并同类项 4(x-y)-(x-y)的二次方-9(x-y)+(x-y)二次方/3

问题描述:

合并同类项 4(x-y)-(x-y)的二次方-9(x-y)+(x-y)二次方/3

4(x-y)-(x-y)的二次方-9(x-y)+(x-y)二次方/3
=(4-9)(x-y)-(1-1/3)*(x-y)的二次方
=-5(x-y)-3分之2*(x-y)的二次方