The more math problems in junior high school, the better, and it is best to attach answers

It's a bit much, I don't make as much as the guy downstairs.

The original question is not.

2x-1)/3=(x+a)/2-1?

When removing the denominator. If -1 on the right side of the equation is not multiplied by 6, then the original equation becomes 2(2x-1)=3(x+a)-1.

x=2 substitution, which can be solved.

a=1 3 and then a=

1 3 brings back the original equation, there is.

2x-1)/3=(x+

1. Solution. x=-3

Not detailed, add points.

If it is (2x-1) (3*2)=x+a-1, then the denominator is removed.

The ---1 on the right side of the equation is not multiplied by 6

then we get (2x-1)=6*(x+a)-1

Because x=2 brings in a=4 3

Then the original equation is (2x-1) (3*2)=x+4 3-1, then x=-3 4

Set: A total of x participants in the competition.

x(x-1)/2=15

Solution: Since the thickness of a piece of paper is, and two folds are, so there are two decimal places) and rounded to 98313 times.

A: 983125 folds are required.

The thickness of the fold is twice the original, and the fold can be folded x times, then there is an equation x 2 to the power of x = solve it yourself.

Think of it this way. 8) The area you are asking for is actually the area of the rectangle minus the area of CEF, ABF and ADE. Therefore, we need to find the total area of the rectangle 8) The total area of the rectangle is s

Solution: 55-50=5 500-5*10=450 450*=6750 Answer: The monthly sales volume is 450 kilograms, and the monthly sales profit is 6750 yuan.

2}y=**10}=-10x +1400x-40000A: y=-10x +1400x-40000.

3}When y=8000, 8000=-10x +1400x-40000 solves: x1=60 x2=80

A: The sales unit price should be set at 60 yuan.

Will you give points next time?

The connection ae is blocked by the collapse of dc=de, de=ae

The group is dec= dce = d=60° because d= dae=60°

The chain is stranded with bac=120°

I don't know how to do it, but the first floor of the Tong Slag Biju did it wrong, the first floor of the beam stove means that the triangle DCE is an equilateral triangle, but dc=de=bc=ae, then how is it possible to ec=bc=ae!