If the folded rectangle is similar to the original rectangle, the ratio of length to width of the original rectangle is______ ．

If the folded rectangle is similar to the original rectangle, the ratio of length to width of the original rectangle is______ ．

Let the length of rectangles be a, the width be B, and the ratio of the corresponding sides be equal. Then we get: BfAb = EFBC, that is: A2B = Ba, then B2 = A22, ∧ a2b2 = 2, ∧ AB = 2:1

Simple calculation: 6 / 7 + 8 / 11-5 / 22

6/7+8/11-5/22
=6/7+(8/11-5/22)
=6/7+(16/22-5/22)
=6/7+1/2
=12/14+7/14
=19/14

About work efficiency
A total of 30 wells were drilled within the time limit, but 30 more wells were drilled every day than originally planned. As a result, the task was completed five days ahead of schedule. How many wells were drilled per day as originally planned?
Let's set the determinant
Well, I have the wrong number
A total of 30 wells should be drilled within the time limit, but three more wells should be drilled every day than originally planned. As a result, the task was completed five days ahead of schedule. How many wells should be drilled per day as originally planned?

Is the landlord drilling 3 more wells every day than originally planned
Solution: suppose that the original planned number of days for drilling x wells per day is t
t=30/x
t-5=30/（x+3）
Solution
X = - 6 (rounding off) x = 3
So it was planned to drill three wells a day

What is the quotient of the product of two 0.8 divided by the sum of two 0.8?

0.8×0.8 ÷ (0.8+0.8) =0.64÷1.6=0.4

Area formula and volume formula of all figures?

Triangle: base times height divided by two
Trapezoid: top bottom plus bottom multiplied by height divided by two
Parallelogram: base multiplied by height
Rectangle: multiply the length by the width

80 ° 32 ′ 15 ″ + 90 ° 27 ′ 45 ″ 100 ° - 36 ° 18 ′ 52 ″ 54 ° 36 ′ 18 ″ × two thirds 57 ° 30 ′ 5 process

80°32′15″+90°27′45″=(80°+90°)+(32′+27′)+(15″+45″)=170°+59′+60″=170°+59′+1′=170°+60′=170°+1°=171°100°-36°18′52″=99°59′60″-36°18′52″=(99°-36°)+(59′-18′)+(60″-52″)=...

When using the image method to solve the equations MX + y = 1,4x NY = 3, if the lines of the two equations coincide, then M = (), n = ()
Please write the answer process, explain the reason, speed!

MX + y = 1
3mx+3y=3
Then 3M = 4,3 = - n
Then M = 4 / 3, n = - 3

Simplification ratio: 36 minutes: 1 hour, 1 meter: 20 cm, 1.5 tons: 1000 kg, 5 / 2 hours: 5 / 2, 1.8:9 / 5, 0.85:0.5
One third: one fourth

36 minutes: 1 hour = 36:60 = 3:5
1m: 20cm = 100:20 = 5:1
1.5T: 1000kg = 1500:1000 = 3:2
5 / 2: 5 / 2 = 60:1
1.8: Nine fifths = 1:1
One third: one fourth = 4:3

Solving the equations {3x + 2y-5 {2x-y = 1}

3x+2y=5
4x-2y=2 7x=7 x=1 y=1
The "=" of the first equation seems to be marked with "-"

How to calculate 115 * 20 + 55 * 15-125 * 5 and 2000-1 + 9 * 111 * 999

115*20+55*15-125*5=23*5*5*4+5*11*5*3-25*25=92*25+33*25-25*25=（92+33-25）*25=100*25=25002000-1+9*111*999=2000-1+999*999=2000-1+（1000-1）^2=2000-1+1000000-2000+1=1000000