4 x6 x8 x10 x28 x30

Under the age of one year - swaddling;

2 3 years old - child;

The girl is 7 years old - the year of hair;

The boy is 8 years old - the year of the dragon;

Juvenile general name - total horn;

Under 10 years old - yellow mouth, that is, it is a childish children's pronoun;

13 15 years old - the year of the spoon dance;

15 20 years old—the year of the elephant dance;

12 years old (female) - the year of the golden hairpin;

13 years old (female) - cardamom years, 15 years old (female) - and the year of Xuan;

15 years old (male) - the year of learning.

16 years old (female) - broken melon years, jasper years, 28 years;

20 years old (female) - Tao Li Nianhua;

24-year-old (female) Hua Xinnian;

to marry - the year of plum, the year of standard plum;

to 30 years old (female) - half-aged;

20 years old (male) - weak crown;

30 years old (male) - the year of establishment;

In the prime of life - the peak of spring and autumn;

40 years old (male) - the year of not being confused, the year of strength;

50 years old - more than half a hundred years old, the year of knowing wrong, the year of knowing fate, the year of Aifu, the year of Dayan;

60 years old - the year of the sixtieth year, the flat-headed jiazi, the year of the ear, the year of the cane township, and the year of the calendar;

70 years old - the year of the ancient rarity, the year of the cane, the year of the matter, the year of the government, the year of the heart, the year of the suspension;

80 90 years old - the old age;

90 years old;

100 years old - expectation, also known as "Renrui".

40-38-10, 36-34, 10-......Ten 8 a 6 ten 4 a 2 = (40 ten 36 ten ......108 104)-(38+34 10......Ten 6 Ten 2) = [(40 + 4) 10 2]-[38 + 2) 10 2] = (44-40) 5

2 dec 4 dec 6 dec 8 dec 10 6x(5) 30) How did 6x5 come about?

Summary. What is 38 ten 26 two () ten 10 equal to?

Equal to 74 pairs lol. Okay.

Add from the middle of both sides, 2 + 20, 4 + 18, 6 + 16, 8 + 14, 10 + 12, all are 22, 5 22, is 110（…omitted the law, or there will be no answer)

= (2 10 18) + (4 10 16) + (6 10 14) .20 two 20 ten 20 ten 20 ...Ten 10

20ⅹ5+20=11o

Think: 2+18=20, put them together with the combination method, then it becomes a whole 2o, and then look at 4 and 16 can also be combined together to form 20, then there are 4 groups of numbers combined into 20 all the time, and there are 5 in the formula, plus a single 10, it is 110.

=(2+20)x10÷222x5

Formula: (first item + snag item) x number of items 2

2 x4 x6 x8 ten ......Ten 58 Ten 60 = 62 15 = 930.

Because the first and last two numbers are 2 + 60 = 62, 4 + 58 = 62, 6 + 56 = 62 ,......28+34=62，30+32=62。

2 x4 x6 x8 ten ......Ten 58 ten 60 "has a total of 30 numbers added, every two groups, there are 15 groups, then there are 15 62, so the sum is 62 15 = 930.