How to use 1997 + 998 + 96 + 1999 + 20 Urgent

=2000-3+1000-2+100-4+2000-1+20
=2000+1000+100+2000+20-3-2-4-1
=5120-10
=5110

The square of 2012 is easy to calculate

Square of 2012
=(2000+12)²
=4000000+48000+144
=4048144

How much is the square of 11 ~ 20? Urgent!

11²=121
12²=144
13²=169
14²=196
15²=225
16²=256
17²=289
18²=324
19²=361
20²=400
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How much is one twelfth times one twelfth

It's equal to 1 / 144

How to prove that the number of subsets of set a is 2n

A subset of a set can contain any element in the set, or even an empty set, so each element in the set can be selected or not. Each element has two choices X 2 is the nth power of 2

The solution of the equation 5x-m = 0 about X is 2 smaller than that of the equation 3Y + M = 0 about y, then the value of M is?

5x-m＝0,x=m/5
3y+m=0,y=-m/3
y-x=-2,-m/3-m/5=2
8/15m=-2
m=-15/4

In the formula, all denominators are four digits. Please fill in a number in each square to make the equation hold. 1 / () + 1 / 1988 = 1 / () ()
process
Is this the only solution
Why?

1/(3×1988)+3/(3×1988)=4/(3×1988)
So 1 / 5964 + 1 / 1988 = 1 / 1491

X △ 5 / 6 = 7 / 15 [equation]
5x + 5 of 11 = 25

x=7/15×5/6
x=7/18
5/11x=25-5
x=20÷5/11
x=44

sin22°30′cos22°30′=______ ．

Sin22 ° 30 'cos22 ° 30' = 12 × 2sin22 ° 30 'cos22 ° 30' = sin (2 × 22 ° 30 ') = sin45 ° = 22

2 / 3 of a number is 11 more than 5 / 2 of 25. What is this number? Use the equation

x*2/3-25*5/2=11
x=441/4

How to use 1997 + 998 + 96 + 1999 + 20 Urgent