来自廖明生的问题
m²(x-y)+n²(y-x)(x+y)²-4(x²-y²)+4(x-y)²4(1+2x-3y)+(3y-2x)²2乘以a的n+1次方减去12乘以a的n次方+18乘以a的n-1次方
m²(x-y)+n²(y-x)
(x+y)²-4(x²-y²)+4(x-y)²
4(1+2x-3y)+(3y-2x)²
2乘以a的n+1次方减去12乘以a的n次方+18乘以a的n-1次方
1回答
2020-04-25 00:09