Middle School Mathematics Finding Explanations for Fractional Equations Help

Solution: If the walking speed is x, the bicycle speed is 4x

According to the title, 7 x + (19-7) 4 x = 2

7+12/4=2x

x=5 km.

Answer: Slightly.

If you can walk at a speed of x kilometers per hour, then you can ride a bicycle at a speed of 4 kilometers per hour! The distance traveled by the bicycle is (19 7) kilometers, and according to the question: 7 x (19 7) 4 x 2, and the solution is x 5 4 x 20, so the speed of walking is 5 kilometers per hour, and the speed of cycling is 20 kilometers per hour.

Let the walking speed be x km h, then the bicycle speed is 4x km h x 7 + 4x 12 2 Multiply 4x on both sides of the equation to get x=5, so 4x=20 so the walking speed is 5 km h The bicycle speed is 20 km h

Let the walking speed be x, then 7 x+12 4x=2, and the solution is: x=5

If the walk is x, then the bicycle is 4x 19-7=12

7 divided by x) + (12 divided by 4x) = 2

If the speed of walking is x, the speed of the bicycle is 4x.

7--- plus --12-- equals 2 solution; x is equal to 5Check, when x is equal to 5, 4x is not 0Then x is equal to 5 and is the original fractional equation.

x 4x.

It can only be said to be a half-pair, first of all, in the process of "multiply both sides by (x-3), get x-3=-2(x-3)" This error may be that you made a mistake (you should get x a=-2 (x-3)).

And then you have to say it at the end because of X-3≠0

So x≠3, so (a+6) 3≠3

Therefore, a≠3 so the value range of a is a -6, and a ≠ 3

No, make sure that the numerator is not 0, i.e. x≠3

That is, (a+6) 3≠3 gives a≠3

In summary, a -6 and a ≠3

1.Assuming that the original plan is to repair x meters per day, then the equation is solved to get x=80

2.Let A process x pieces per day and B process y pieces per day, then 1200 x-10 = 1200 y, y =, solve the equation to obtain x=40, y=60;

3.Let A spread x kilometers per week and B spread y kilometers per week, then x+1=y, 18 x-3=18 y solve the equation to get x=2, y=3

Set the normal trace key, highway speed, attitude, and block x

600/x=2*480/(x+45)

600x+600*45=960x

360x=600*45

x=75600 plus 75=8 hours.

Put 1 generation into -x square + 3 into the calculation When you encounter a constant, you will bring it, it should be calculated like this, I counted two parts, but I have to sleep.

It's very unclear, give you a clear answer.

5x=-y-z

So x 2=(y+z) 2

So y 2+z 2-x 2=-2yz

y^2=(x+z)^2

So z 2+x 2-y 2=-2xz

z^2=(x+y)^2

So x 2 + y 2-z 2 = -2xy

So the original formula =1 (-2yz)+1 (-2xz)+1 (-2xy) =x (-2xyz)+y (-2xyz)+z (-2xyz) =(x+y+z) (-2xyz) =0

6x/3y=y/2x-5y

2x^2-5xy-3y^2=0

x-3y)(2x+y)=0①

x/3y=6x-15y/x

x^2-18xy+45y^2=0

x-3y)(x-15y)=0②

y/2x-5y=6x-15y/x

xy=3(2x-5y)^2

x-3y)(12x-25)=0③

If both are true, x-3y=0, x=3y

4x^2-5xy+6y^2)/(x^2-2xy+3y^2)=[4(3y)^2-5*(3y)*y+6y^2]/[(3y)^2-2*(3y)*y+3y^2]

1.From the known, x+y=-z, (x+y) 2=z 2, can be reduced to: x 2+y 2-z 2=2xy, the same way is y 2+z 2-x 2=2yz, z 2+x 2-y 2=2xz, the original formula =1 2yz+1 2xz+1 2xy=(x+y+z) 2xyz=0

2.From the known x=3y, the original formula = [4(3y) 2-5 3y·y+6y 2] [(3y) 2-2 3y·y+3y 2]=9 2