Please help me, it s really hard to choose.

I think as a girl you should be able to protect yourself, unrequited love or crush can only hurt yourself in the end, since he is like this now, even if you get him in the future, your life will not be stable, he will treat you like other girls now, so I think give up!

Charming, but not a good thing! Let's break up.

Solution: The power went out for x minutes.

Equations are listed according to the question.

1-1 120*x (1-1 60*x)*2 solution x 40

Suppose the candle is m long. Burned for x minutes.

Available: m-1 2x=2(m-x).

m=3/2x

The results are known.

Solution: Thick candles burn 1 2 per hour

Thin candles burn 1 1 per hour

Set a power outage for x hours.

then 1 1 2 x 2 (1 1 1 x).

Solution x 2 3 hours 40 minutes.

So the power outage lasted for 40 minutes.

Assuming that the blackout time is t and the candle length is l, then the coarse candle burns l2 per hour and the thin candle burns l, then there is the following equation:

l-tx(l/2)=2(l-tl/1)

l-tl/2=2l-2tl

l=3/2tl

1=3/2t

t = 2 3 hours = 40 minutes.

The function is in a three-quadrant, the y value of -1 is negative, so it is the smallest, and the function of the first quadrant is a subtraction function, so y2 is greater than y3, so y1 is less than y3 less than y2 and d is selected

Hello, it's a pleasure to answer for you.

Solution: If there are x denominations of 5 yuan, then if there are (5-x) contrays of 10 yuan, then the total face value of all 5 yuan denominations is 5x, and the total denomination of all 10 yuan denominations is 10 (5-x).

5x+10（5-x）=40

Simplification yields 50-5x=40

Solution: If the father's age after x years is 3 times the son's age, then the father's age after x years is (50+x) and the son's age is (20+x).

50+x）/（20+x）=3

Simplification yields 50+x=3(20+x).

Solution: If there are x boys and 54-x girls, then the boys plant 3x trees and the girls plant 2 (54-x) trees.

3x+2（54-x）=137

Simplification yields 2x+108=137 hopes.

(1) Solution: There are x sheets of 5 yuan, and there are 5-x sheets of 10 yuan.

5x+10（5-x）=40

2) Solution: Let the father's age be 3 times the son's age after x years.

50+x=3（20+x）

3) Solution: If there are x boys, then there are 54-x girls.

3x+2（54-x）=137