计算:(1)(3x 2 y) 3 ?(-5y);(2)[(x+y) 2 -y(2x+y)-4x]÷2x

计算:(1)(3x 2 y) 3 ?(-5y);(2)[(x+y) 2 -y(2x+y)-4x]÷2x.
2025-06-20 23:59:32
推荐回答(1个)
回答1:

(1)原式=27x 6 y 3 ?(-5y)=-135x 6 y 4
(2)原式=(x 2 +y 2 +2xy-2xy-y 2 -4x)÷2x
=(x 2 -4x)÷2x
=
1
2
x-2.