trong không gian với hệ trục tọa độ oxyz hình chiếu của điểm m(-1,0,3) theo phương vecto v=(1,-2,1) trên mặt phẳng x-y+z+2 = 0 có tọa độ là:

A.(2,-2.,-2)                                  B.(-1,0,1)                              C.(-2,2,2)                          D.(1,0,-1)

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   +1 =   ?

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Trên bàn có 5 hộp quà với khối lượng khác nhau. Cân các hộp quà này theo tất cả các cặp có thể (sao cho mỗi hộp quà đều được cân với các hộp quà còn lại) thì được kết quả sau đây:

Hãy tính khối lượng của hộp quà nặng nhất.

tìm dấu bằng

66666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666ooooooooooooooooooooooooooooo0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY=IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII

Một cửa hàng bán carvat dự định giảm giá nhân dịp Ngày của Cha. Bình thường, nếu bán với giá 600 000 đồng một chiếc thì bán được 350 cái một tuần. Nếu giảm giá, cứ mỗi lần giảm 30 000 đồng một chiếc thì bán thêm được 25 cái mỗi tuần. Biết chi phí nhập một chiếc carvat là 270 000 đồng. Chi phí trang trí cửa hàng (chi phí cố định) là 2000 000 đồng.

a. Tìm công thức hàm lợi nhuận theo giá (biết số lượng carvat bán ra là hàm bậc nhất theo giá một chiếc carvat).

b. Hỏi cửa hàng nên giảm giá bao nhiêu để được lợi nhuận tối đa? Tìm số lượng bán ra và lợi nhuận khi đó.

mọi người giúp mình với