3 simple math problems to solve, 3 simple math questions.

Updated on educate 2024-08-05
12 answers
  1. Anonymous users2024-02-15

    The first question is incorrect.

    Question 2 a = 14

    5x+y=3(1)

    x-2y=5(2)

    From (2) x=5+2y(3) to (1) 5(5+2y)+y=3 11y=-22 y=-2 to bring in (3)x=1

    Bring x=1 y=-2 into ax+5y=4 a*1+5*(-2)=4 a-10=4 a=14

    Question 3 Xiaoqiang is 16 years old and his uncle is 28 years old.

    The ages of Xiaoqiang and Uncle are x and y respectively. Rule.

    x-(y-x)=4

    x+(40-y)=y

    x=16,y=28

    Xiaoqiang is 16 years old and his uncle is 28 years old.

  2. Anonymous users2024-02-14

    1. (There is a problem with the question).

    2. The system of equations about x and y 5x+y=3 has the same solution as x-2y=5, ax+5y=4

    Simultaneous equations 5x+y=3

    x-2y=5 ②

    2, get 10x+2y=6

    Get 11x=11

    x=1 brings x=1 into to get 5*1+y=3

    y=-3 gives x=1

    y=-3 brings x=1 into ax+5y=4, and we get.

    y=-3a+5*(-3)=4

    a-15=4

    a=193, solution: Set Xiaoqiang is x years old this year, and his uncle is y years old this year.

    Let Xiaoqiang's age be A, and his uncle's age be B

    x-(y-x)=4

    x+(40-y)=y

    Organize the system of equations, get.

    2x-y=4①

    x-2y=-40②

    2 gets 2x-4y=-80

    3y=84

    y=28 substitute y=28 into it.

    x=16A: Xiaoqiang is 16 years old and his uncle is 28 years old.

  3. Anonymous users2024-02-13

    The first question, there is a problem with the question, condition 2 and condition 3 are added, and the equation is 0, how can it be -6

    In the second problem, there is the same solution, which means that the x of the two formulas is equal, and the y-generation x5x+y=3 is replaced by x=(3-y) 5 and the other formula is transformed into x=5+2y, and the simultaneous equation y-3 5=5+2y solves y=-2

    Substituting the original system of equations to solve x x = 1

    Finally, we find a=14

    The third question is to set the uncle to be X years older than Xiaoqiang, Xiaoqiang's age is used in generation A, and the uncle is in generation B.

    When I was your age, you were only four years old, which means a-x=4(1) b-x=a, and when you were my age, a+ x =b(2) I would be forty b+x=40(3).

    According to the equation listed.

    2), (3) a+x+x=40

    According to (1) a=4+x

    Then, according to the two formulas just obtained, x=12, a=16, and b=28 are solved

  4. Anonymous users2024-02-12

    a=14 Let Xiaoqiang's age be a and his uncle's age be b

    a-(b-a)=4

    a+(40-b)=b

    a=16,b=28

    Xiaoqiang is 16 years old and his uncle is 28 years old.

    I don't know anything = = thus. Anonymity.

  5. Anonymous users2024-02-11

    The first question is wrong.

    10*x-2y=6

    10x-2y+(x-2y)=6+5

    x=1y=-2

    a=143.Xiaoqiang is 16 years old and his uncle is 28 years old.

  6. Anonymous users2024-02-10

    The first question should have been written incorrectly. There is no solution.

    Question 2 a = 14

    Question 3 Xiaoqiang is 16 years old and his uncle is 28 years old.

  7. Anonymous users2024-02-09

    1. I can't do it, 2 and 3 can't be established at the same time, are you sure you didn't copy the question wrong?

    2. The two equations are solved separately to obtain y=-2 and x=1, then a*1+5*(-2)=4, and a=4+10=14

    3. Set Xiaoqiang is x years old this year, and his uncle is y years old this year, because the age gap between the two remains the same, so x-4=y-x=40-y, and the age of the two this year is x+y=44, and the age difference is y-x=12, so x=16, y=28

  8. Anonymous users2024-02-08

    Add the two formulas and see what happens. So this question is wrong.

    2.The two forms are combined, and the common point of the two straight lines is substituted for a:a=14

    3.Let Xiaoqiang, uncle x, and y years old respectively, and the equation can be x-(y-x)=4 y+(y-x)=40

  9. Anonymous users2024-02-07

    I don't understand why you posted this, and you can see it at a glance, give me the score, don't play tricks.

  10. Anonymous users2024-02-06

    The first question is wrong.

    x=1 y=-2, so a=14

    Set strong x years old, uncle y years old 2y-x=40 2x-y=4 get x=16 y=28

  11. Anonymous users2024-02-05

    1: Give 1 2 to the two respectively, and then become a trigonometric function, cos30sinx+sin30cosx=sin(30+x).

    2: As in the first question, multiply 1 2 by 2, i.e. 2*( 2 2sinx- 2 2cosx) = 2sin(45-x).

    3:2√2(1/2cosx-√3/2sinx)=2√2cos(60+x)

  12. Anonymous users2024-02-04

    1, it is known that the terminal edge of the foot passes through the annihilation attack of Changdian's Pao P (then a>0 sin =4 5 cos =3 5 a, "Zen Pei 0sin =-4 5 cos =-3 5

    2. Compare the size of sin(-23-5)cos23>cos45

    3, tan +1 = 0, the solution set is k +3 4, known cos = 1 5 and tan <0 then sin = -2 root number 6 54, f(x) = 5x+1 then f(x+1) = 5x+6

Related questions
13 answers2024-08-05

and 1/4l, which is 5/4l, i.e. 5 4, 5 4 12 = 60 4, i.e. 15

2. The unknown number is set to x, x 2 3 is written as 3 2 5 12, that is, x 3 2 5 12, x 2 3 = 5 12, multiply 3 2 on both sides at the same time, and get x 5 8, that is, the original question is 5 8 2 3 15 16 >>>More

9 answers2024-08-05

1) 29 people, [(42-32)-4]+[42-35)-4]+4 Explain that 10 people can ride bicycles, 7 people can skate Because there are 4 people, they will subtract 4 people from both, so there will be 6 people who can only ride bicycles, and 3 people who can only skate >>>More

4 answers2024-08-05

If the duration of the hit ** is rounded up to an integer of minutes. >>>More

17 answers2024-08-05

Is it a square of x or a square of x? Aren't there operators like parentheses?

17 answers2024-08-05

Correct Answer: 1Let the speed of car A be V A, then the speed of V B is V A + 30, 10 * (V A + V A + 30) = V A * 1 + 1060, from which it is obtained that V A = 40 km hours, and the distance between the two cities of A and B = 40 * 1 + 1060 = 1100 km. >>>More