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Hướng dẫn về nhà:
•
Học thuộc phần ghi nhớ.( trang 61 ).
Làm bài tập: 19.3,19.4 và 19.5 trang 23,24
SBT.
1. Bài vừa học
2. Bài sắp học:
•
^SỰ NỞ VÌ NHIỆT CỦA CHẤT KHÍ .
•
s?L!: 20.1 trang 63 SGK.