华中中三2024 E Math EOY答案

s=5r*sqrt(q/(1-25r^2)) (12x-5y)/3(x+3)(x-3) 12/5 2(3x^2-6x+4) 3cm y=4/3x-2/3 A(1/2, 0), B(0, -2/3) 53.1 deg

11sqrt(2) step 1: translate 5 units in the positive x direction Step 2: scale parallel to the y-axis by a scale factor 4/3 y=3/4x-7/4 C(12, 29/4) 68.75 It is more than the actual area

a=2, b=3

((1, c), (-d-3, 1)) ((cd+4, 2c), (2d, cd)) M=((200,200,120), (220,180,150)) T=(8.84, 8.73) It represents the total costs needed for baking 24 chocolate cakes and 25 cookis respectively s=((4.5, 0), (0, 5)) P=(39.78, 43.65)

79.2 839 8.27 17.6 deg center(5,-2), radius=4 12

21 .7 76.0 47.5