Question

[(a+b)(a-b)-(a-b)的平方+2b(a-b)]除以4(a-b)

过程要完整点

Answer 1

原式=(a²-b²-a²+2ab-b²+2ab-2b²)÷4(a-b)
=(-4b²+4ab)÷4(a-b)
=4b(a-b)÷4(a-b)
=b

Answer 2

[(a+b)(a-b)-(a-b)的平方+2b(a-b)]除以4(a-b)
=(a-b)[(a+b)-(a-b)+2b]÷[4(a-b)]
=(a+b-a+b+2b)÷4
=4b÷4
=b