Kiểm tra một tiết lớp: 7a môn: Đại số

Trường THCS Xuân Áng KIỂM TRA MỘT TIẾT
Lớp: 7 A Môn: Đại số
Họ và tên: _______________________
 Điểm
 Lời phê của thầy (cô) giáo
ĐỀ BÀI.
Câu 1 (2 đ): Phát biểu định nghĩa và tính chất của đại lượng tỉ lệ nghịch.
Câu 2 (2 đ): Đại lượng y tỉ lệ thuận với đại lượng x được liên hệ theo công thức y = kx (k là hằng số khác 0) . Biết x1 = 3 và y1 = 6.
	a .Hãy tìm hệ số tỉ lệ k.
b .Tìm y khi x = 17 và x = 1,125.
Câu 3 (4 đ): Ba đội máy cày,cày ba cánh đồng cùng diện tích. Đội thứ nhất cày xong trong 2 ngày, đội thứ hai trong 3 ngày, đội thứ ba cày xong trong 4 ngày. Biết rằng đội thứ hai có nhiều hơn đội thứ ba 1 máy (năng suất các máy như nhau). Hỏi mỗi đội có bao nhiêu máy?
Câu 4 (2 đ): Cho hàm số y=f(x)= 5x2 - 2 .Tính: f(0) ; f(1); f(-3); f()	
BÀI LÀM
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