1.已知等式(2m-5n)x+3m-8n=8x+10,对一切有理数x成立,求m,n的值.2.对于实数x,y,定义一种新的运算“*”,x*y=ax+by,其中a,b为常数,等式右边是通常的加法和乘法运算,已知3*5=15,4*7=28,求a+b的值.3.已知方程
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![1.已知等式(2m-5n)x+3m-8n=8x+10,对一切有理数x成立,求m,n的值.2.对于实数x,y,定义一种新的运算“*”,x*y=ax+by,其中a,b为常数,等式右边是通常的加法和乘法运算,已知3*5=15,4*7=28,求a+b的值.3.已知方程](/uploads/image/z/14886423-63-3.jpg?t=1.%E5%B7%B2%E7%9F%A5%E7%AD%89%E5%BC%8F%EF%BC%882m-5n%EF%BC%89x%2B3m-8n%3D8x%2B10%2C%E5%AF%B9%E4%B8%80%E5%88%87%E6%9C%89%E7%90%86%E6%95%B0x%E6%88%90%E7%AB%8B%2C%E6%B1%82m%2Cn%E7%9A%84%E5%80%BC.2.%E5%AF%B9%E4%BA%8E%E5%AE%9E%E6%95%B0x%2Cy%2C%E5%AE%9A%E4%B9%89%E4%B8%80%E7%A7%8D%E6%96%B0%E7%9A%84%E8%BF%90%E7%AE%97%E2%80%9C%2A%E2%80%9D%2Cx%2Ay%3Dax%2Bby%2C%E5%85%B6%E4%B8%ADa%2Cb%E4%B8%BA%E5%B8%B8%E6%95%B0%2C%E7%AD%89%E5%BC%8F%E5%8F%B3%E8%BE%B9%E6%98%AF%E9%80%9A%E5%B8%B8%E7%9A%84%E5%8A%A0%E6%B3%95%E5%92%8C%E4%B9%98%E6%B3%95%E8%BF%90%E7%AE%97%2C%E5%B7%B2%E7%9F%A53%2A5%3D15%2C4%2A7%3D28%2C%E6%B1%82a%2Bb%E7%9A%84%E5%80%BC.3.%E5%B7%B2%E7%9F%A5%E6%96%B9%E7%A8%8B)
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