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hoangtam2018
2 năm trước
Bài 1: Viết dạng khai triển các hàng đẳng thức sau: a) (x-y)(x^2+xy+y^2) b) (y-2x)^2 Bài 2:phân tích đa thức sau thành nhân tử a) 5x(x-2y)-2(x-2y) b) (x-y)^2-4x^2 c) xy+y^2-x-y d) 25-x^2+2xy-y^2 bài 3: tìm x biết a) 3x+2(5x+x)=0 b) x(x-5) +x-10=-5 bài 4:rút gọn rồi tính giá trị biểu thức A tại x=-1999;y=2 A=(x+2)(x-2)-2x(x-y)+(x-y)^2
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