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Solution: Let the principal amount be x yuan.

x+3x*x+x=20000

A: The principal amount is 20,000 yuan.

The annual equivalent savings of parents is 1,548 yuan. The calculation process is as follows:

According to the equation x=a(q n-1) (q-1), 40000=a[(1+5%) 17-1] [(1+5%)-1]a=1548(yuan)

1 (1) Profound meaning, profound meaning, small words (2) Commonplace, commonplace 2 (1) Confucius, Mingqiu, the word Zhongni, the late Spring and Autumn period of the Lu people, Confucius was a great thinker, politician, educator, and founder of Confucianism in the late Spring and Autumn Period.

2) 1. If you learn without thinking, you will be reckless, and if you think without learning, you will die.

2. Threesomes must have my teacher.

3. The gentleman is frank and swaying, and the villain is a relative.

3 This passage of Confucius uses the analogy + metaphorFigures of speech.

4(1) Execution.

Three chickens equals 60, and each chicken is 20

A chicken + two baskets of eggs = 26, that is, a basket of eggs is 3, each egg is 1 basket of eggs + two bananas = 15, that is, a handful of bananas is 6, each banana is 1 chicken + a basket of eggs 5 bananas = 20 + 3 5 = 35

A chicken is equal to 20

A basket of eggs is equal to 3

A bunch of bananas is equal to 6

The answer is 29

29？？It's not a brain teaser type.

Profit: 800x5 40 So the selling price cannot be lower than 840 yuan.

1200x7％＝840

So up to 7% off.

Both sides of the inequality are multiplied by the same number, and the direction of the unequal sign is unchanged.

Multiply the same number on both sides of the inequality at the same time, and the direction of the inequality sign does not change.

(Unit efficiency problem) the first: 34000 + 2 = 34002 yuan 34002 yuan 10 million times = that is to say, every 10,000 times spent yuan.

The second: the same way 7800+ yuan 120 10,000 times That is to say, the second mold costs about 120 yuan per 10,000 times.

To sum up: the first mold will be much more cost-effective.