3x的2次方+(-2⼀3x+1⼀3y的2次方)(2x-2⼀3y)其中x=1⼀3,y=2⼀3(好的会采纳滴!)

2024-12-21 18:35:07
推荐回答(1个)
回答1:

(3×1/3)²+[-2/3×1/3+﹙1/3×2/3﹚²]×﹙2×1/3-2/3×2/3﹚
=1+2/13×2/9
=1+44/117
=161/117