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一、判断。1.一袋盐重50%千克。()2.一根绳子剪去它的13,还剩23米。()3.将一个长5厘米、宽4厘米、高2厘米的长方体切成两个长方体,表面积至多增加20平方厘米。()
First, judge. A bag of salt weight 50% kg. () 2. A rope cut it 13, 23 meters left. () 3. Cut a rectangular parallelepiped 5 cm long, 4 cm wide and 2 cm high into two cuboids with a surface area of at least 20 cm 2. ()