Brother can t figure it out! I m going to kill myself! Everybody come in and help!

You don't need to care too much about falling in love.

Something is a certain state of affairs, maybe you have done something that she can't trust, just correct it!

I think it's very normal.,From a girl's point of view,,I also like older boys.,Can't accept boys younger than yourself.,And it's a boy who is similar to his father in some places.,I don't know if it's a psychological disorder.,But maybe what's more important than age is the feeling he gives her.,As a girl,Looking for a boyfriend is more like looking for safety.,I want my boyfriend to be calm and mature.。 If their boyfriend is too naïve, they will feel tired, because looking for a boyfriend is to give themselves a shoulder to lean on, to be able to give her love and care, not for them to take care of their boyfriend. In that case, in front of her boyfriend, they are like children, enjoying the safety and care he brings her.

Therefore, it is not to see whether you grow up to be immature, but to see whether your heart is immature.

1) Let the tolerance of the difference series be d, then.

a3=a1+2d=10, s11=11a1+11 10 2d=11, the solution is a1=16, d=-3

The general formula for the series is: an=a1+(n-1)d=16-3(n-1)=19-3n

2) From (1) know an=19-3n, a1=16

Therefore sn=n(a1+an) 2=(19-3n+16)n 2=-3 2n 2+35 2n=-3 2(n-35 6) 2+1225 24

This parabolic opening is downward, and when n = 35 6, the sn is maximum. But because n is a positive integer, when n=5, sn=50;When n=6, sn=51>50

The maximum value of sn is 51, and n is 6

Solution: From the triangle noisy area formula: s 1 2ab·sinc is known: a=4, b=5, s=5 3, substituting into the formula, obtains: sinc 3 2 c 60 or 120

This theorem can be obtained by cosine

c a b 2ab·cosc 21 or 61c 21 or 61

Remember my answer, oh, I wish you progress in your studies.

Hello! Let the right-angled sides be a, b (aa 2+b 2 = c 2 = large square area = 13(a+b) 2 = a 2+2ab+b 2 = 25, so 2ab = 12

Small square area = (b-a) 2 = b 2+a 2 - 2ab = 1

1 10 times the root number 2cm; 5 times the root number 2

4/3 times m; 5/3 m do not know.