定义一种新运算:a★b=a+b/a-b.若3★m=1/3,a★b=a-b分之a+b 3★m=3分之1
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![定义一种新运算:a★b=a+b/a-b.若3★m=1/3,a★b=a-b分之a+b 3★m=3分之1](/uploads/image/z/2580513-33-3.jpg?t=%E5%AE%9A%E4%B9%89%E4%B8%80%E7%A7%8D%E6%96%B0%E8%BF%90%E7%AE%97%3Aa%E2%98%85b%3Da%2Bb%2Fa-b.%E8%8B%A53%E2%98%85m%3D1%2F3%2Ca%E2%98%85b%3Da-b%E5%88%86%E4%B9%8Ba%2Bb+3%E2%98%85m%3D3%E5%88%86%E4%B9%8B1)
定义一种新运算:a★b=a+b/a-b.若3★m=1/3,a★b=a-b分之a+b 3★m=3分之1
定义一种新运算:a★b=a+b/a-b.若3★m=1/3,
a★b=a-b分之a+b 3★m=3分之1
定义一种新运算:a★b=a+b/a-b.若3★m=1/3,a★b=a-b分之a+b 3★m=3分之1
3*m=3+m/3-m=1/3,
3+m=1/3(3-m)
,3+m=1-1/3m,
4/3m=-2,
m=-3/2
由题得 3★m=(3+m)/(3-m)=1/3
∴3*(3+m)=3-m
m=-3/2
m等于负1•5
3★m=3+m/3-m 所以m=-3/2
3+m/3-m=1/3
解得m=-3/2