20210701的学习
7.1 Learning English,magnet.复习数学,直线、增量、斜率、负斜率。 加油 拉格朗日橙子 加油兄弟 7.2 position , on , under, behind. motion, leap. 直线的的方程,点-斜方程。 7.4 Learning English.m=(y-y1)/( X-X1).y= m(X-X1)+ y1. 斜率为m,y-截距b的直线,方程y=mx+b . 7.9 Changing matter.Physical change. Chemical change. 7.15 Learning English.Electricity is a kind of energy. power plant. Wire. Outlet. Cord. Machines. 7.19Motion, Gravity, force, strainght, speed, pull, push. 7.20Magnet.pole, repel, attract. Where is it? It's on your table.oh, there it is.
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