计算:(5x平方+3y平方)(5x平方-3y)
问题描述:
计算:(5x平方+3y平方)(5x平方-3y)
答
(5x²+3y²)(5x²-3y)
=5x²(5x²-3y)+3y²(5x²-3y) (按多项式乘法法则展开)
=25x^4+15x²y²-15x²y-9y³
(5x²+3y²)(5x²-3y²)=25x^4-9y^4