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在小学数学教学中,有些教师对几何概念的使用不够准确,现举例如次: (一)垂直有的教师讲“垂直和平行线”时,指着手中的铅垂线说:“砌房时用这条吊线,可以使墙与地面垂直,就是运用了垂直的道理。”又指着两面墙壁的交线说:“这条线与地面垂直,与地平面垂直。”我们知道,在小学阶段,教学内容局限于同一平面的两直线垂直,这在课文中用“两条直线相交”作
In elementary mathematics teaching, some teachers are not accurate enough to use the concept of geometry. For example: (1) When some teachers in the vertical talk about “vertical and horizontal lines”, pointing to the plumb line in their hands, they said: “When building a house Using this hanging wire, the wall can be made perpendicular to the ground, using the vertical principle. ”Also pointing to the intersection of the two walls,“ This line is perpendicular to the ground and perpendicular to the ground. ”We know that in the elementary school , Teaching content is limited to the same plane two straight lines, which in the text with “two straight lines intersect” for