1.a,b表示两个数,规定a*b=(a+b)-(a-b),以知9*=4,求x的值2.对于数a,b,c,d,规定[a,b,c,d]=2ab-d/c.以知[1,2,3,x]=2,求x的值3.如果5◇2=5+6=11,5◇3=5+6+7=18,◇◇◇◇◇2◇5=2+3+4+5+6=20;那么,若(x◇3)◇2=49,求x的值 4.对
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![1.a,b表示两个数,规定a*b=(a+b)-(a-b),以知9*=4,求x的值2.对于数a,b,c,d,规定[a,b,c,d]=2ab-d/c.以知[1,2,3,x]=2,求x的值3.如果5◇2=5+6=11,5◇3=5+6+7=18,◇◇◇◇◇2◇5=2+3+4+5+6=20;那么,若(x◇3)◇2=49,求x的值 4.对](/uploads/image/z/12055971-3-1.jpg?t=1.a%2Cb%E8%A1%A8%E7%A4%BA%E4%B8%A4%E4%B8%AA%E6%95%B0%2C%E8%A7%84%E5%AE%9Aa%2Ab%3D%28a%2Bb%29-%28a-b%29%2C%E4%BB%A5%E7%9F%A59%2A%3D4%2C%E6%B1%82x%E7%9A%84%E5%80%BC2.%E5%AF%B9%E4%BA%8E%E6%95%B0a%2Cb%2Cc%2Cd%2C%E8%A7%84%E5%AE%9A%5Ba%2Cb%2Cc%2Cd%5D%3D2ab-d%2Fc.%E4%BB%A5%E7%9F%A5%5B1%2C2%2C3%2Cx%5D%3D2%2C%E6%B1%82x%E7%9A%84%E5%80%BC3.%E5%A6%82%E6%9E%9C5%E2%97%872%3D5%2B6%3D11%2C5%E2%97%873%3D5%2B6%2B7%3D18%2C%E2%97%87%E2%97%87%E2%97%87%E2%97%87%E2%97%872%E2%97%875%3D2%2B3%2B4%2B5%2B6%3D20%EF%BC%9B%E9%82%A3%E4%B9%88%2C%E8%8B%A5%EF%BC%88x%E2%97%873%29%E2%97%872%3D49%2C%E6%B1%82x%E7%9A%84%E5%80%BC+4.%E5%AF%B9)
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