câu 3 : Thu gọn đơn thức M= 2xy. (-1/2xy³) =? Câu 4: Bậc của đơn thức x o x²y³ là : Câu 5: Tìm hiệu của hai đơn thức 5x²y = 4x²y là : Câu 6:Thế nào là hai đơn thức đồng dạng Câu 7: Nghiệm của đa thức -9x+3 Câu 8: Nếu P(x) - (x² -3xy +y²) = 2x² -xy +4xy² Tìm p(x)=? Câu 9: Cho đa thức p(x) = -x⁴+x³ -2x + 2 - 5 Tìm bật của đa thức Câu 10: Cho đa thức p(x) = -x⁴ +3x²+5-2x³+x Tính p(1)= ? Câu 11:Giao điểm ba đường cao của một tam giác là gì Câu 12: Bộ ba nào là độ dài ba cạnh của tam giác 3cm ; 4cm ; 5cm 2cm ; 5cm ; 7cm Câu 13: Cho đa thức -2x⁴+3x²-6x⁵+yx Tìm hệ số cao nhất và hệ số tự do Câu14: Cho ∆DEF có ^D =40° ; ^E= 60° Tính số đo ^F=80° Câu 15 : Cho A=4x² - 5xy +3y² B= 3x² + 2xyb+y² C= -x² + 3xy +2xy² Tính C - A=? Câu 16: Tính giá trị của biểu thức N = 1000x ²⁰²⁰ y²⁰²¹ + 2000 x ²⁰²⁰y²⁰²¹ Câu 17: Trong tam giác tù , cạnh đối diện nối góc tù là cạnh lớn nhất Câu18: Tìm x biết 6x +5x+² =650 Câu 19: Cho ∆ABC cân ABC =AC = 10cm BC =12cm ; M là trung điểm của BC Tính độ dài AM

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