8th Grade Math Chapter 14 A Function Unit Test Is there an answer?

Updated on educate 2024-08-07
8 answers
  1. Anonymous users2024-02-15

    The teacher will have the answer when he finishes speaking.

  2. Anonymous users2024-02-14

    Solution: Set up to be transported from place A.

    X tons of fertilizer to C, 200-x tons of fertilizer from A to D, 240-x tons of fertilizer from B to C, 260-(200-x) tons from B to D (preferably a table) The total freight is Y tons.

    y=20x+25(200-x)+15(240-x)+24(x+60)=4x+10040(0≤x≤200)

    k = 4 0 and y is smallest when x = 0.

    0 tons from A to C and 200 tons from A to D.

    B is shipped to C for 240 tons and B for D for 60 tons.

  3. Anonymous users2024-02-13

    Typing out the title, we don't have a book in our hands, and if you don't say any version of the book, it's useless to have a book.

  4. Anonymous users2024-02-12

    11 I won't talk about drawing, you draw it yourself, there are 2 :

    y=x-1 y=-x+1

    2) From the meaning of the title: curly braces y=-x-3 (x less than or equal to -3) y=x+3 (-3 less than or equal to x less than or equal to 0).

    y=-x+3 (x is greater than 0).

    Draw these three lines in the drawing, pay attention to the stool Sakura search: the middle is a line segment, and the other two are rays.

    12. Set from A to X tons to C, and the freight of the jujube calendar is Y

    From the title: y=20x+25(200-x)+15(240-x)+24(x+60).

    That is, y=4x+10040 (60 is less than or equal to x, less than or equal to 200), because y increases with x.

    So when x=60, y is minimal.

    Answer: 60 tons from A to C, 140 tons from A to D; 180 tonnes from B to C, 120 tonnes from B to D

  5. Anonymous users2024-02-11

    11.y=x-1 y=-x+1.

    2) From the meaning of the title: curly braces y=-x-3 (x less than or equal to -3) y=x+3 (-3 less than or equal to x less than or equal to 0).

    y=-x+3 (x is greater than 0).

    Draw this three lines Note: The middle is a line segment, and the other two are Zhilun Stove rays.

    12. Set from A to X tons to C, and the freight is Y

    From the title: y=20x+25(200-x)+15(240-x)+24(x+60).

    That is, y=4x+10040 (60 less than or equal to x, less than or equal to 200), because y increases with x.

    So when x=60, y is minimal.

    Answer: 60 tons from A to C, 140 tons from A to D; From B to 180 tons of tung block to C, from B to 120 tons to D

  6. Anonymous users2024-02-10

    12. Set from A to X tons to C, and the freight is Y

    From the meaning of the title: y = 20x + 25 (200-x) group stuff + 15 (240-x) + 24 (x + 60).

    That is, y=4x+10040 (0 fiber resistance x 200 per acre) because y decreases with x.

    So when x=0, y is the smallest.

    Answer: From A to 0 tons to C, 200 tons to D; From B to 240 tons to C, 60 tons to D.

  7. Anonymous users2024-02-09

    It is known that the function y=y1-y2, where y1 is proportional to x-1 and y2 is proportional to x+1, and when x=0, y=-5; When x=1, y=-6Find the functional relationship between the simplified y and the posture x.

  8. Anonymous users2024-02-08

    y=30x+50x(6-x)+40x(10-x)+80x[12-(10-x)]

    20x+860

    The shipping fee does not exceed 900 yuan for the group, and there are 4 plans.

    When X is equal to 0, that is, all the cars in County A are the verification of Jialuo's Heyun, and the minimum freight is 860 yuan.

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