28:49 (reduction ratio)

28:49 (reduction ratio)

Divide by seven
Four to seven

Simplification of simple mathematical problems
3(a+b+c)-2(-2a-b+c)

Simple calculation of mathematical problems (fraction)
1/4*37+0.75*21
(1 / 30 + 1 / 35 + 1 / 63) * 2 and 1 / 7
18*6/7+6*1/7+16/7*6
1880 * 199 and 9 / 10-1999 * 187 and 9 / 10
39*148/149+148*86/149+48*74/149
2004 divided by 2004 and 2004 / 2006
51 and 2 / 3 * 3 / 5 + 71 and 3 / 4 * 4 / 7 + 91 and 4 / 5 * 5 / 9
1998+1989*1987/1988*1989-1
1 / 1 * 2 = 1-1 / 2, 1 / 2 * 3 = 1 / 2-1 / 3, 1 / 3 * 4 = 1 / 3-1 / 4, 1 / 4 * 5 = () - (), 1 / 5 * 6 = () - (). 1 / N * (n + 1) () - (); by using the above rule, we can calculate that
1/1*2+1/2*3+1/3*4+1/4*5+1/5*6+1/6*7
Explanation + formulation

1 / 4 * 37 + 0.75 * 21 = 37 / 4 + 3 / 4 * 21 = 37 / 4 + 21 * 3 / 4 = 37 / 4 + 63 / 4 = 100 / 4 = 25 (1 / 30 + 1 / 35 + 1 / 63) * 2 and 1 / 7 = (1 / 5 * 6 + 1 / 5 * 7 + 1 / 7 * 9) * 15 / 7 = (1 / 5-1 / 6 + 2 / 5-2 / 7 + 2 / 7-2 / 9) * 15 / 7 = (3 / 5 - 1 / 6 - 2 / 9) * 15 / 7 = (5

Simple calculation (score)
Simple calculation:
1 ／ one and 2 / 1 ／ one and 3 / 1 ／ one and 4 / 1 ／ 1 and 30 / 1

Original form
＝1÷3/2÷4/3÷5/4 …… ÷31/30
=1×2/3×3/4×4/5 …… ×30/31
＝(1×2×3×4×…… ×30×××)/（3×4×5×…… ×31）
= 2 / 31

How many square meters of carpet do you need to lay on a staircase, which is 2 meters high, 2 meters wide and 3 meters long

This length should refer to the horizontal handle
The carpet is attached to the surface of the stairs
The elevation of all stair steps, its height sum = stair height
The plane of all steps, its length sum = stair length
Total area = width × (height + length)
= 2 × (2 + 3) = 10 square meters

There is some oil in one oil barrel. If the oil is doubled, the whole barrel weighs 28 kg. If the oil is quadrupled, the whole barrel weighs 46 kg. How many kg is there in the original oil barrel? How many kilos per barrel?

(46-28) / [(4-1) - (2-1)] = 18 ÷ 2 = 9 (kg); 28-9 × 2 = 28-18 = 10 (kg). Answer: there was 9 kg oil in the oil barrel and 10 kg oil in the oil barrel

The total amount is: 67346.38 (please distribute this one according to the following requirements)
Three leading cadres (25% more than ordinary cadres)
8 general cadres (25% more than assistant managers)
7 assistants (25% more than cleaners)
4 cleaners (according to normal distribution)
Please write down the result of the calculation

Suppose that each cleaner is allocated X Yuan, 4x + 7x (1 + 25%) + 8x (1 + 25%) (෇178; + 3x (1 + 25%) (ා179; = 67346.38 (4 + 8.75 + 12.5 + 5.859375) x = 67346.3831.109375x = 67346.38x = 2164.825876443998 yuan, and each assistant is allocated 2164.825876443998 × 1.25 = 2706.032

What are the characteristics of electronic calculators? (), (), (), (), a total of five

It has the function of memory and logic judgment. It can run automatically and support human-computer interaction

There are several simple mathematical problems,
1. (three quarters minus two thirds) divided by one fifth
2. Four fifths multiplied by seven eighths plus seven eighths divided by five
3. (one minus eight fifteen times three fourths) divided by three fifths
4. One minus 5 / 8 divided by 25 / 28 and 3 / 10
5. [5 / 6 minus (1 / 2 minus 1 / 3)] divided by 4 / 9
Simple calculation,

1 =(9/12-8/12)*5=5/122 =4/5*7/8+7/8*1/5=7/8*(4/5+1/5)=7/8*1=7/83 =(1-8/15*3/4)*5/3=5/3-8/15*3/4*5/3=5/3-2/3=14 =1-(5/8*28/25+3/10)=1-(7/10+3/10)=05 =(5/6-3/6+2/6)*9/4=4/6*9/4=3/2

If m square of 3 equals 7 and n square of 3 equals 11, then what is m square + n square of 3 equal to?

M square + n square of 3
=3^(m+n)
=3^m*3^n
=7*11
=77