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三元一次方程 3x+4y+z=14 x+5y+2z=17 2x+2y-z=3 请写出必要过程
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1年前
A group of adults, highly succeeded in their jobs, went to visit their old professor.
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Last Friday a storm swept through two villages in the New Territories, destroying fourteen homes.
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如图,把一张长方形ABCD的纸片,沿EF折叠后,ED′与BC的交点为G,点D、C分别落在D′、C′的位置上,若∠EFG=55°,求∠1、∠2的度数.
1年前