Number (3): Everything in this light blue space must add up to 3. The answer is 1-2, placed vertically.
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If we think about this algebraically, what we really want to do is express the input pixel as the weighted sum of palette colours. This is nothing more than a linear combination of palette colours with weights :。关于这个话题，Line官方版本下载提供了深入分析
For the next few days, Jupiter, Saturn, Venus, Mercury, Neptune and Uranus will all be visible at the same time in the night sky – although binoculars or a telescope will be needed to spot the latter two planets.