5th:
Last day for academic performance.
6th:
学术展示报告
姓名：
日期：
内容： 1/3B1h+1/3B2h+1/3B3h+…+1/3Bnh
=1/3B1r+1/3B2r+1/3B3r+…+1/3Bnr
=1/3r(B1+B2+B3+…+Bn)
=1/3r*4*3.14*r*r
=4/3*3.14*r*r*r
=
结论：我的球的体积为： 。
I will explain it more about it to all the students during Friday’s math class.
7th: review the note and there will be a small quiz about it tomorrow.
8th: P598-599 1-21
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