来自廖瑞金的问题
【（1）[（-1/3)x²y][(3/4)y²-(1/2)x+(1/3)](2）12x²y[（-2/3)x²-(5/6)xy+(3/4)y²](3)(4x²-y²)[(2x+y)²-(2x-y)²]注：“/”是分数线,1/2是二分之一】
（1）[（-1/3)x²y][(3/4)y²-(1/2)x+(1/3)]
(2）12x²y[（-2/3)x²-(5/6)xy+(3/4)y²]
(3)(4x²-y²)[(2x+y)²-(2x-y)²]
注：“/”是分数线,1/2是二分之一
1回答
2020-03-10 07:25