(1) (5m²+3n²)²-(3m²+5n²)²
问题描述:
(1) (5m²+3n²)²-(3m²+5n²)²
(2) xy³-2x²y²+x³y (³ 这个是3)
(3) (x²+4y²)²-16x²y²
答
(5m²+3n²)²-(3m²+5n²)²=【(5m²+3n²)-(3m²+5n²)】【(5m²+3n²)+(3m²+5n²)】=(2m²-2n²)(8m²+8n²)=16...