x的2次方(3x+5y)的2次方-y的2次方(5x+3y)的2次方
=[x(3x+y)]的平方 - [y(5x+3y)]的平方
=[x(3x+y)+y(5x+3y)]*[x(3x+y)-y(5x+3y)]
=(3x平方+6xy+3y平方)*(3x平方-4xy-3y平方)
=3(x+y)的平方*(3x平方-4xy-3y平方)
x的2次方(3x+5y)的2次方-y的2次方(5x+3y)的2次方
=[x(3x+y)]的平方 - [y(5x+3y)]的平方
=[x(3x+y)+y(5x+3y)]*[x(3x+y)-y(5x+3y)]
=(3x平方+6xy+3y平方)*(3x平方-4xy-3y平方)
=3(x+y)的平方*(3x平方-4xy-3y平方)