lim(x->∞)[x^7(1-2x)^8/(3x+2)^15]求极限答案是lim(x->∞)[x^7(1-2x)^8/(3x+2)^15]=lim(x->∞)[(1/x-2)^8/(3+2/x)^15]=(0-2)^8/(3+0)^15=2^8/3^15;x^7是怎么去掉的?还是答案错了
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![lim(x->∞)[x^7(1-2x)^8/(3x+2)^15]求极限答案是lim(x->∞)[x^7(1-2x)^8/(3x+2)^15]=lim(x->∞)[(1/x-2)^8/(3+2/x)^15]=(0-2)^8/(3+0)^15=2^8/3^15;x^7是怎么去掉的?还是答案错了](/uploads/image/z/10915033-49-3.jpg?t=lim%28x-%3E%E2%88%9E%29%5Bx%5E7%281-2x%29%5E8%2F%283x%2B2%29%5E15%5D%E6%B1%82%E6%9E%81%E9%99%90%E7%AD%94%E6%A1%88%E6%98%AFlim%28x-%3E%E2%88%9E%29%5Bx%5E7%281-2x%29%5E8%2F%283x%2B2%29%5E15%5D%3Dlim%28x-%3E%E2%88%9E%29%5B%281%2Fx-2%29%5E8%2F%283%2B2%2Fx%29%5E15%5D%3D%280-2%29%5E8%2F%283%2B0%29%5E15%3D2%5E8%2F3%5E15%EF%BC%9Bx%5E7%E6%98%AF%E6%80%8E%E4%B9%88%E5%8E%BB%E6%8E%89%E7%9A%84%3F%E8%BF%98%E6%98%AF%E7%AD%94%E6%A1%88%E9%94%99%E4%BA%86)
lim(x->∞)[x^7(1-2x)^8/(3x+2)^15]求极限答案是lim(x->∞)[x^7(1-2x)^8/(3x+2)^15]=lim(x->∞)[(1/x-2)^8/(3+2/x)^15]=(0-2)^8/(3+0)^15=2^8/3^15;x^7是怎么去掉的?还是答案错了
lim(x->∞)[x^7(1-2x)^8/(3x+2)^15]求极限
答案是lim(x->∞)[x^7(1-2x)^8/(3x+2)^15]=lim(x->∞)[(1/x-2)^8/(3+2/x)^15]
=(0-2)^8/(3+0)^15
=2^8/3^15;
x^7是怎么去掉的?还是答案错了
lim(x->∞)[x^7(1-2x)^8/(3x+2)^15]求极限答案是lim(x->∞)[x^7(1-2x)^8/(3x+2)^15]=lim(x->∞)[(1/x-2)^8/(3+2/x)^15]=(0-2)^8/(3+0)^15=2^8/3^15;x^7是怎么去掉的?还是答案错了
答案是对的,分子分母同除以x^15
原来分子上的x^7就被约掉了
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