已知a/b=2/3,则a²-3ab-b²/a²-2ab+b²的值是__________
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/02 22:36:12
![已知a/b=2/3,则a²-3ab-b²/a²-2ab+b²的值是__________](/uploads/image/z/3923709-69-9.jpg?t=%E5%B7%B2%E7%9F%A5a%2Fb%3D2%2F3%2C%E5%88%99a%26%23178%3B-3ab-b%26%23178%3B%2Fa%26%23178%3B-2ab%2Bb%26%23178%3B%E7%9A%84%E5%80%BC%E6%98%AF__________)
已知a/b=2/3,则a²-3ab-b²/a²-2ab+b²的值是__________
已知a/b=2/3,则a²-3ab-b²/a²-2ab+b²的值是__________
已知a/b=2/3,则a²-3ab-b²/a²-2ab+b²的值是__________
a/b=2/3
a=2/3b
a²-3ab-b²/a²-2ab+b²
=(2/3b)²-3*2/3b*b-b²/(2/3b)²-2*2/3b*b+b²
=4/9b²-2b²-b²/4/9b²-4/3b²+b²
=(-23/9b²)/(1/9b²)
=-23