已知m,x,y满足2/3(x-5)²+5|m|=0,(2)-2a²b^(y+1)与7a²b³是同类项,求代数式式2x²-6y²+m(xy-9y²)-(3x²-3xy+7y²)的值2x²-6y²+m(y-9y²)-(3x²-3xy+7y²)的值
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![已知m,x,y满足2/3(x-5)²+5|m|=0,(2)-2a²b^(y+1)与7a²b³是同类项,求代数式式2x²-6y²+m(xy-9y²)-(3x²-3xy+7y²)的值2x²-6y²+m(y-9y²)-(3x²-3xy+7y²)的值](/uploads/image/z/3020211-27-1.jpg?t=%E5%B7%B2%E7%9F%A5m%2Cx%2Cy%E6%BB%A1%E8%B6%B32%2F3%28x-5%29%26%23178%3B%2B5%7Cm%7C%EF%BC%9D0%2C%EF%BC%882%EF%BC%89-2a%26%23178%3Bb%5E%28y%2B1%29%E4%B8%8E7a%26%23178%3Bb%26%23179%3B%E6%98%AF%E5%90%8C%E7%B1%BB%E9%A1%B9%2C%E6%B1%82%E4%BB%A3%E6%95%B0%E5%BC%8F%E5%BC%8F2x%26%23178%3B-6y%26%23178%3B%2Bm%EF%BC%88xy-9y%26%23178%3B%EF%BC%89-%EF%BC%883x%26%23178%3B-3xy%2B7y%26%23178%3B%EF%BC%89%E7%9A%84%E5%80%BC2x%26%23178%3B-6y%26%23178%3B%2Bm%EF%BC%88y-9y%26%23178%3B%EF%BC%89-%EF%BC%883x%26%23178%3B-3xy%2B7y%26%23178%3B%EF%BC%89%E7%9A%84%E5%80%BC)
已知m,x,y满足2/3(x-5)²+5|m|=0,(2)-2a²b^(y+1)与7a²b³是同类项,求代数式式2x²-6y²+m(xy-9y²)-(3x²-3xy+7y²)的值2x²-6y²+m(y-9y²)-(3x²-3xy+7y²)的值
已知m,x,y满足2/3(x-5)²+5|m|=0,(2)-2a²b^(y+1)与7a²b³是同类项,求代数式
式2x²-6y²+m(xy-9y²)-(3x²-3xy+7y²)的值
2x²-6y²+m(y-9y²)-(3x²-3xy+7y²)的值
已知m,x,y满足2/3(x-5)²+5|m|=0,(2)-2a²b^(y+1)与7a²b³是同类项,求代数式式2x²-6y²+m(xy-9y²)-(3x²-3xy+7y²)的值2x²-6y²+m(y-9y²)-(3x²-3xy+7y²)的值
∵2/3(x-5)^2+5ImI=0
∴x=5,m=0
又-2a^2b^(y+1)与7a^2b^3是同类项,
∴y+1=3
y=2
∴2x^2-6y^2+m(xy-9y^2)-(3x^2-3xy+7y^2)=2x^2-6y^2-3x^2+3xy-7y^2
=-x^2-13y^2+3xy
=-5^2-13*2^2+3*5*2
=-47