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JSTaCuong
2 năm trước
a. Cho y=f(x) là hàm số chẵn trên R và y=g(x) là hàm số lẻ trên R, biết rằng f(2)=7 và g(-2)=3 giá trị f(-2) -3.g(2) b. Cho tam giác ABC và D là điểm thỏa mãn vecto DC =2 vectoDA - 3vecto DB. Đường thẳng CD cắt đường thẳng AB tại K. Khi đó vecto KB=m.vectoAB. Xác định số thực m
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