若(2x+y-1)²+|x-2y-3|=0,求代数式(3x+y)(3x-y)-(x+2y)(x-y)-3的值已知a+1/a=5,求a-1/a的值
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![若(2x+y-1)²+|x-2y-3|=0,求代数式(3x+y)(3x-y)-(x+2y)(x-y)-3的值已知a+1/a=5,求a-1/a的值](/uploads/image/z/754254-54-4.jpg?t=%E8%8B%A5%EF%BC%882x%2By-1%EF%BC%89%26sup2%3B%2B%7Cx-2y-3%7C%3D0%2C%E6%B1%82%E4%BB%A3%E6%95%B0%E5%BC%8F%EF%BC%883x%2By%EF%BC%89%EF%BC%883x-y%EF%BC%89-%EF%BC%88x%2B2y%EF%BC%89%EF%BC%88x-y%EF%BC%89-3%E7%9A%84%E5%80%BC%E5%B7%B2%E7%9F%A5a%2B1%2Fa%3D5%2C%E6%B1%82a-1%2Fa%E7%9A%84%E5%80%BC)
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若(2x+y-1)²+|x-2y-3|=0,求代数式(3x+y)(3x-y)-(x+2y)(x-y)-3的值已知a+1/a=5,求a-1/a的值
若(2x+y-1)²+|x-2y-3|=0,求代数式(3x+y)(3x-y)-(x+2y)(x-y)-3的值
已知a+1/a=5,求a-1/a的值
若(2x+y-1)²+|x-2y-3|=0,求代数式(3x+y)(3x-y)-(x+2y)(x-y)-3的值已知a+1/a=5,求a-1/a的值
2x+y-1=0
x-2y-3=0
x=1
y=-1
(3x+y)(3x-y)-(x+2y)(x-y)-3
=2*4+1*2-3
=8+2-3
=7