设 y=ln(2(根号x)—1),求dx
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设 y=ln(2(根号x)—1),求dx
2.69 = 0.999126X /(1546-222)-(3480-X)
2.69 = 0.999126X /1324-(3480-X)
两边乘1324
3561.56=0.999126X-4607520+1324X
1324.999126X=4611081.56
X=4611081.56/1324.999126
X约等于3480.1
原式=(xy²)/(x+y)(x-y)-[x^4y/(x²+y²)(x²-y²)][(x²+y²)/x²]
=(xy²)/(x+y)(x-y)-x²y/(x²-y²)
=-xy(x-y)/(x+y)(x-y)
=-xy/(x+y)
2.69 = 0.999126X /1324-(3480-X)
两边乘1324
3561.56=0.999126X-4607520+1324X
1324.999126X=4611081.56
X=4611081.56/1324.999126
X约等于3480.1
原式=(xy²)/(x+y)(x-y)-[x^4y/(x²+y²)(x²-y²)][(x²+y²)/x²]
=(xy²)/(x+y)(x-y)-x²y/(x²-y²)
=-xy(x-y)/(x+y)(x-y)
=-xy/(x+y)
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