(a+b)(a-b)-(a-b)²+2b²a=2 6=1/2求大神·还有解题过程详细一点·只写算式看不懂

(a+b)(a-b)-(a-b)²+2b²a=2 6=1/2求大神·还有解题过程详细一点·只写算式看不懂
(a+b)(a-b)-(a-b)²+2b²a=2 6=1/2
求大神·还有解题过程详细一点·只写算式看不懂

(a+b)(a-b)-(a-b)²+2b²a=2 6=1/2求大神·还有解题过程详细一点·只写算式看不懂
(a+b)(a-b)-(a-b)²+2b²
=a²-b²-(a²-2ab+b²)+2b²
=a²-b²-a²+2ab-b²+2b²
=a²-a²+2ab+2b²-b²-b²
=2ab
=2x2x1/2
=2