分数计算器

Historians have long recognized the traditional Japanese sword, or nihonto, as one of the finest cutting weapons everproduced, but it has even been considered a spiritual entity. The adage “the sword is the soul of the samurai” reflects the sword'spsychic importance, not only to its wielder, but also to its creator, the master smith. Not classically regarded as artists, mastersmiths nevertheless exerted great care in the process of creating swords, no two of which were ever forged exactly the sameway. Over hundreds of hours, two types of steel were repeatedly heated, hammered, and folded together into thousands ofimperceptible layers, yielding both a razor-sharp, durable edge and a flexible, shock-absorbing blade. Commonly, though optionally,the smith physically signed the blade; moreover, each smith's secret forging techniques left an idiosyncratic structural signature.Each unique finished product reflected the smith's personal honor and devotion to craft, and today, the Japanese sword is valuedas much for its artistic merit as for its historical significance.

P, Q, R, S, and T are companies, with offices in India, the USA, and Germany.

The following figure gives the percentage distribution of sales of each company through their branches in different countries.

What is the least positive integer that is not a factor of 20! and is not a prime?

Even those accustomed to the austere beauty of mathematics may be daunted by the __________ with which Bourbaki conducts his proofs.

A recent assessment of the status of global amphibian populations identified habitat loss as the single greatest identifiable factor contributing to amphibian declines. Habitat loss primarily results from the residential, agricultural, arboricultural, or recreational development of an area. Anthropogenic conversion of land has caused significant reductions in the wetland, forest, and grassland habitat that amphibians require for their survival. Outright habitat loss probably has the greatest effect on amphibians, but habitat degradation or the general decline in the health of habitat often results from environmental contamination, the introduction of exotic invasive species, or a reduction in required resources within a habitat, and similarly affects amphibians. Likewise, habitat fragmentation (the disruption or fragmentation of habitat into discontinuous or isolated remnants of viable habitat) emerges from isolated patches of habitat loss and can often have delayed effects on animal populations.