(-2a+3b)눀

2024-11-28 18:02:49
推荐回答(2个)
回答1:

解链蔽:
(-2a+3b)²
=(-2a)岁唤铅²+2x(-2a)x(3b)乎好+(3b)²
=4a²-12ab+9b²

回答2:

(-2a+3b)²
=4a^2-12ab+9b^2