A very simple question with a good answer gives a high score of 30

Early periods do not affect the safe period. According to the day you said, the 21st ML is within the safe period. It is not possible to get pregnant during the safe period, but the premise is that the safe period contraceptive method is only suitable for women who have a stable period.

If your girlfriend's regular vacation time is not particularly fixed, the chance of problems will be greater. If she's very regular, you don't have to worry.

Satisfied?

There is no chance of getting pregnant, there is no chance of any effect. Satisfaction is a plus.

Nothing is absolute, just pay attention.

Put a hundred hearts, it won't! ~

The chance of collecting days after menstruation is very small, only a few tenths of a percent.

Absolutely not

Said that it would take at least the 24th to get pregnant.

You're only the 21st

Absolutely not

Give me a point

I cried and begged.

This is not menstrual blood, there will be withdrawal bleeding after taking medicine, and the menstrual period will become irregular during this time, but it is absolutely safe at this time, and there is also about 1% of the possibility of pregnancy during the safe period, so the safe period is not absolutely safe, and many unplanned pregnancies occur during the safe period, so if you don't want your girlfriend to go to the operating table often, wear a condom every time...

Three days before the start of menstruation and four days after the end of menstruation are dangerous periods, and post-mortem remedies are recommended.

You will never get pregnant, don't worry!

Loving someone can give everything for him or her.

Loving someone can change everything for him or her.

Loving someone can fight for everything for him or her.

Loving someone can make him or her happy forever.

To put it simply, you have another person's name imprinted in your heart!

=(a+b) 2: b 2: b 2 (a+b) 2 a 2 let q1=(a+b) 2 k

q2= b^2 k= a^2 m

q3= (a+b)^2 m

By Q2= B2K= A2 m and Q3= (A+B) 2 m

q3= b 2 (a+b) 2 a 2 k so q1:q2:q3=(a+b) 2: b 2: b 2 (a+b) 2 a 2

Is that right..

a^2:a^2b^2/(a+b)^2:b^2

From the above two equations, we can get: Q1:Q3=A 2:B 2, because we don't need to know the specific value, so we can make Q1=A 2, Q3=B 2, and then we can find the value of Q2.

a :a b (a+b) :b Q1:Q3=A:b Conclusions are drawn from the above.

1250 m = (1 1 4) km.

3080 kg = (3 and 2 25) tons.

100 seconds = (1 and 2 3) minutes.

235 square centimeters = (2 and 7 20) square decimeters.

90 minutes = (1 and 1 2).

2 meters 30 centimeters = (2 and 3 10) meters.

16,500 square meters = (1 and 13 20) hectares.

1700 ml = (1 and 7 10) liters.