求值(a+b)(a-b)+(a+b)²-a(2a+b)明天要交了a=2/3b=-3/2

Question

求值(a+b)(a-b)+(a+b)²-a(2a+b) 明天要交了
a=2/3
b=-3/2

Answer 1

(a+b)(a-b)+(a+b)²-a(2a+b)
=a²-b²+a²+2ab+b²-2a²-ab
=ab
=2/3×(-3/2)
=-1