Đề +MT+đ án Đ số 9 chương I

Đề ( gồm 2 trang)
Câu 1: (1,5 đ)
a)Tìm x để căn thức
có nghĩa b) Tìm x, biết:
với


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Câu 2: (4,5 đ)
Thực hiện phép tính:

b)


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c)
d)
e)


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Câu 3: (1,5 đ)
Chứng minh đẳng thức:


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Câu 4: (2,5 đ)
Rút gọn và tính giá trị của biểu thức:

với
;
tại

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