当x+1⼀3,y=1时,求下列代数式的值:(1)3x눀-2y눀+1 (2)(x-y)눀⼀xy-1

2025-05-11 00:33:07
推荐回答(1个)
回答1:

(1)原式=3*(1/3)²-2*1²+1=-2/3
(2)原式=(1/3-1)²/(1/3*1)-1=1/3