1.计算:1/(m^2-m)+(m-2)/(2m^2-2)
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1.计算:1/(m^2-m)+(m-2)/(2m^2-2)
2.用2种不同的运算顺序计算:(x/(x-2)-x/(x+2))*2-x/x(建议一种先算括号里面的,一种用乘法分配率)
2.用2种不同的运算顺序计算:(x/(x-2)-x/(x+2))*2-x/x(建议一种先算括号里面的,一种用乘法分配率)
![1.计算:1/(m^2-m)+(m-2)/(2m^2-2)](/uploads/image/z/17205444-36-4.jpg?t=1.%E8%AE%A1%E7%AE%97%EF%BC%9A1%2F%28m%5E2-m%29%2B%28m-2%29%2F%282m%5E2-2%29)
1 =2/(2m^2-2)+(m-2)/(2m^2-2)=m/(2m^2-2)
2 ={x*[(x+2)/(x+2)(x-2)+(x-2)/(x+2)(x-2)]}^2-1
=[2x^2/(x+2)(x-2)]^2-1
=[4x^4/(x^2-4)^2]-1
=(3x^4+8x^2-16)/(x^4-8x^2+16)
or
=[x^2/(x-2)^2]-2*x^2/(x+2)(x-2)+[x^2/(x+2)^2]-1
=[x^2(x+2)^2-2x^2(x+2)(x-2)+x^2(x-2)^2]/(x+2)^2(x-2)^2 -1
=[4x^4/(x^2-4)^2]-1
=(3x^4+8x^2-16)/(x^4-8x^2+16)
2 ={x*[(x+2)/(x+2)(x-2)+(x-2)/(x+2)(x-2)]}^2-1
=[2x^2/(x+2)(x-2)]^2-1
=[4x^4/(x^2-4)^2]-1
=(3x^4+8x^2-16)/(x^4-8x^2+16)
or
=[x^2/(x-2)^2]-2*x^2/(x+2)(x-2)+[x^2/(x+2)^2]-1
=[x^2(x+2)^2-2x^2(x+2)(x-2)+x^2(x-2)^2]/(x+2)^2(x-2)^2 -1
=[4x^4/(x^2-4)^2]-1
=(3x^4+8x^2-16)/(x^4-8x^2+16)
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