ĐỀ 3:
Bài 1: Tính:
a)
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b)
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Bài 2: Tìm x:
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b)
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d)
; ![](file:///C:/Users/KimAnh/AppData/Local/Temp/msohtmlclip1/01/clip_image018.gif)
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Bài 3: Tìm x, y biết:
và
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Bài 4: Tìm 3 số x, y, z sao cho
và ![](file:///C:/Users/KimAnh/AppData/Local/Temp/msohtmlclip1/01/clip_image026.gif)
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