What do you find? 11 / 18 = 1 / 3 + 1 / 6 + 1 / 9, 13 / 30 = 1 / 5 + 1 / 6 + 1 / 15 Can you fill in the following formula? 13 / 24 = () + () + () notice that the molecules are all 1 15 / 42 = () + () 15 / 36 = () + () + () 13 / 28 = () + () + () I calculated (denominator) is 4 6 12 6 7 18 6 6 18 4 7 12 the denominators I calculated are these in turn, right? What do you find

What do you find? 11 / 18 = 1 / 3 + 1 / 6 + 1 / 9, 13 / 30 = 1 / 5 + 1 / 6 + 1 / 15 Can you fill in the following formula? 13 / 24 = () + () + () notice that the molecules are all 1 15 / 42 = () + () 15 / 36 = () + () + () 13 / 28 = () + () + () I calculated (denominator) is 4 6 12 6 7 18 6 6 18 4 7 12 the denominators I calculated are these in turn, right? What do you find

13/24=1/3+1/8+1/24 21 7 6 6 6 12 7 7 4

The quilts have to be packed. Class 61 packed 9 quilts, but the remaining 3 / 5 of the total number. Class 62 continued to pack. Class 62 packed 13 quilts, but the remaining 2 quilts. See the following supplement for the problem
How many quilts are there altogether?

1-3/5=0.4
9/0.4=22.5
22.5-9-13=0.5
2/0.5=4
4x22.5 = 90

Shampoo 15 yuan per bottle, shopping malls to carry out promotional activities, buy 2 bottles get 1 free. Buy 2 bottles at a time, how much cheaper per bottle?

15-15 × 2 ^ (2 + 1), = 15-15 × 2 ^ (3), = 15-10, = 5 yuan. A: it's 5 yuan cheaper per bottle

If x ＞ 0, y ＞ 0, and 2x + 8y = 1, then XY has the maximum______ Value______ ．

Because x > 0, Y > 0, and 1 = 2x + 8y ≥ & nbsp; 216xy = 8xy, XY ≥ 64, if and only if 2x = 8y and xy = 64 = true

There are 52 people in class 4.1. They buy four boxes just one box for each. How many boxes of drinks are there in each box?

(52-4) △ 4 = 48 △ 4 = 12 (boxes); answer: there are 12 boxes in each box

Simplified evaluation: (√ (1-2sin10 ° cos10 °) / (sin10 ° - √ (1-sin170 °))

（√（1－2sin10°cos10°）／（sin10°－√（1－sin170°））=（√（1-sin20°））/（sin10°-cos10°）=√[（1-sin20°）/(sin10°-cos10°）]=1

On the 1:6000000 scale map, the distance between a and B is 18 cm. A plane flies from a to B for 9 hours, and the speed ratio is 5:4. What is the speed of the plane?

18 ／ 16000000 = 108000000 (CM) = 1080 (km), 9 × 55 + 4 = 5 (H), 9-5 = 4 (H), 1080 ／ 5 = 216 (km / h), 1080 ／ 4 = 270 (km / h); a: the speed of this plane is 270 km / h when going and 216 km / h when coming back

1-2+3-4+5-6+7-8+9-10+…… 2003-2004+2005=

1003 1+（-2+3）+（-3+4）.（-2004+2005）=1003

The two trains run in the same direction at the same time from two stations 80 km apart. Car a is in the back, traveling 70 km per hour. Car B is in the front, traveling 50 km per hour. How many hours later are the two trains 20 km apart?

70*N+20=50*N+80

How to solve the equation (94-2x) △ 4 + x = 35

（94-2X）/4+X =35
(94-2X)/4=35-X
94-2X=4(35-X)
94-2X=140-4X
2X=46
X=23
/Is the division sign 4 (35-x) is the multiplication of 4 (35-x)