快点[(a²＋b²)+2b(a－b)－(a－b)²]÷4b其中2a-b=6

快点[(a²＋b²)+2b(a－b)－(a－b)²]÷4b
其中2a-b=6

[(a²＋b²)+2b(a－b)－(a－b)²]÷4b=(a²+b²+2ab-2b²-a²+2ab-b²)÷4b
=(4ab-2b²)÷4b
=a-b/2
若2a-b=6 b=2a-6,则
原式=a-a+3=3

[(a²＋b²)+2b(a－b)－(a－b)²]÷4b
＝[a²＋b²＋2ab－2b²－a²－b²＋2ab]÷4b
＝[4ab－2b²]÷4b
＝a－b/2.
＝﹙2a－b﹚/2
＝6/2
＝3.

原式
=[a²+b²+2ab-2b²-(a²-2ab+b²)]÷4b
=(4ab-2b²)/4b
=(2a-b)/2
2a-b=6
上式=6/2=3

解原式=[a²+b²+2ab-2b²-(a²-2ab+b²)]÷4b=(4ab-2b²)/4b
=a-b/2

式子展开为（a²＋b²+2ab-2b²-a²+2ab-b²)÷4b=4ab÷4b=4a
答案为a

(a²＋b²)+2b(a－b)－(a－b)²]÷4b=（a²+b²+2ab-2b²-a²+2ab-b²)÷4b=-2b²/4b=0.5b

=[a²＋b²+2ba－2b²－a²-b²+2ba]÷4b
=[－2b²+4ba]÷4b
=a-0.5b