X的平方加2XY加Y的平方减X减Y减2

用十字相乘法做
2025-02-26 14:58:13
推荐回答(2个)
回答1:

X²+2XY+Y²-X-Y-2
=(X+Y)²-(X+Y)-2
=(X+Y-2)(X+Y+1)

回答2:

X²+2XY+Y²-X-Y-2
=(X+Y)²-(X+Y)-2
=(X+Y-2)(X+Y+1)