急:1.已知x=43,y=53,求xy(x²+y²)的值.2.已知x=1/2,y=1/3,求代数式-20x³+60x²y-45y²的值.额……那个一楼的你这样算我也会啊,这么大的数,就这么死算?
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![急:1.已知x=43,y=53,求xy(x²+y²)的值.2.已知x=1/2,y=1/3,求代数式-20x³+60x²y-45y²的值.额……那个一楼的你这样算我也会啊,这么大的数,就这么死算?](/uploads/image/z/4190186-2-6.jpg?t=%E6%80%A5%EF%BC%9A1.%E5%B7%B2%E7%9F%A5x%3D43%2Cy%3D53%2C%E6%B1%82xy%28x%26sup2%3B%2By%26sup2%3B%EF%BC%89%E7%9A%84%E5%80%BC.2.%E5%B7%B2%E7%9F%A5x%3D1%2F2%2Cy%3D1%2F3%2C%E6%B1%82%E4%BB%A3%E6%95%B0%E5%BC%8F-20x%26sup3%3B%2B60x%26sup2%3By-45y%26sup2%3B%E7%9A%84%E5%80%BC.%E9%A2%9D%E2%80%A6%E2%80%A6%E9%82%A3%E4%B8%AA%E4%B8%80%E6%A5%BC%E7%9A%84%E4%BD%A0%E8%BF%99%E6%A0%B7%E7%AE%97%E6%88%91%E4%B9%9F%E4%BC%9A%E5%95%8A%EF%BC%8C%E8%BF%99%E4%B9%88%E5%A4%A7%E7%9A%84%E6%95%B0%EF%BC%8C%E5%B0%B1%E8%BF%99%E4%B9%88%E6%AD%BB%E7%AE%97%EF%BC%9F)
急:1.已知x=43,y=53,求xy(x²+y²)的值.2.已知x=1/2,y=1/3,求代数式-20x³+60x²y-45y²的值.额……那个一楼的你这样算我也会啊,这么大的数,就这么死算?
急:
1.已知x=43,y=53,求xy(x²+y²)的值.
2.已知x=1/2,y=1/3,求代数式-20x³+60x²y-45y²的值.
额……那个一楼的你这样算我也会啊,这么大的数,就这么死算?
急:1.已知x=43,y=53,求xy(x²+y²)的值.2.已知x=1/2,y=1/3,求代数式-20x³+60x²y-45y²的值.额……那个一楼的你这样算我也会啊,这么大的数,就这么死算?
1.xy(x²+y²)
=43(53)(43^2+53^2)
=2279(4658)
=10615582
2.-20x³+60x²y-45y²
=-20(1/2)^3+60(1/2)^2(1/3)-45(1/3)^2
=-2.5+5-5
=-2.5
这个不是求未知数吧
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