若a-b=1,则1⼀2(a^2+b^2)-ab

2024-12-28 02:49:06
推荐回答(2个)
回答1:

1/2(a^2+b^2)-ab
=1/2(a^2-2ab+b^2)
=1/2(a-b)^2
=1/2x1^2
=1/2

回答2:

1/2(a^2+b^2)-ab
=(a²-2ab+b²)/2
=(a-b)²/2
=1/2