The complete square formula of the first year of junior high school: 2010 - # 178; - 2009 - # 178; + +4²-3²+2²-1²

The complete square formula of the first year of junior high school: 2010 - # 178; - 2009 - # 178; + +4²-3²+2²-1²

2010²-2009²+… +4²-3²+2²-1²=(2010-2009)(2010+2009)+(2008-2007)(2008+2007)+...+(2-1)(2+1)=2010+2009+...+2+1=(2010+1)*2010/2=2021055

Looking for 100 questions of fraction calculation
You want fractions or decimals,

1. 3/7 × 49/9 - 4/3 2. 8/9 × 15/36 + 1/27 3. 12× 5/6 – 2/9 ×3 4. 8× 5/4 + 1/4 5. 6÷ 3/8 – 3/8 ÷6 6. 4/7 × 5/9 + 3/7 × 5/9 7. 5/2 -（ 3/2 + 4/5 ） 8. 7/8 + （ 1/8 + 1/9 ） 9. 9 × 5/...

Ask the master to help me solve these score calculation problems (take off) thank you
1、55X（1/33-1/44）
2、91X7/90
3、2003/2004x2005
4、99x99/100

1. Original formula = 55 × 1 / 33-55 × 1 / 44 = 1,2 / 3-1,1 / 4 = 2 / 3-1 / 4 = 5 / 122, original formula = (90 + 1) × 7 / 90 = 90 × 7 / 90 + 1 × 7 / 90 = 70,7 / 903, original formula = 2003 / 2004 × (2004 + 1)

To solve 100 off form calculation problems

Elementary school drop out problem`
It's better to use a simple algorithm`
1.17 divided by 51 + (1 / 68 + 2 / 51) * 17
17 divided by 51 + (1 / 68 + 2 / 51) and multiplied by 17
2.71/5 divided by 125 divided by 8
7 and 1 / 5 divided by 125 and then divided by 8

17 divided by 51 + (1 / 68 + 2 / 51) * 17
＝1/3+1/68*17+2/51*17
＝1/3+1/4+2/3
＝1+1/4
＝1.25
7 and 1 / 5 divided by 125 and then divided by 8
＝36/5÷（125×8）
＝36/5÷1000
＝9/1250

Find a few simple calculation problems in grade six of primary school
three
35—÷9=
four
146÷1.25+15.4×8=
1 2 2
6—×2.4+2—×4—－240％=
3 5 3
999 8 / 9 + 99 8 / 9 + 9 8 / 9 + 1 / 3=
1 / 4 and 2 / 17 + 29 and 2 / 17=
0.1+0.3+0.5+…… +0.9+0.11+…… +0.97+0.99=

What is it? I can't understand it at all! It's more profound than high school!
Can you write it more clearly?!
35 and 3 / 4 △ 9 = 143 / 36
146÷1.25+15.4×8=240
4 + 2 5 / 2 × 4 3 / 2-240% = 24
Now, give me the score!
ha-ha!

Off form calculation and the format of practical questions
Off formula calculation: when calculating, do you want to write "solution formula =..." in front ?
Do you want to write a word "Jie" before writing?

It is not necessary to write the solution, but generally it is not written horizontally
5+6+5
=11+5
=16
Write beautiful format like this, the equal sign should be written on the outside

Calculation: 99.9 × 99... 9 + 199... 9 are n

99.9×99...9+199...9
=(99… 9)²+2*99… 9+1
=(99… 9+1)²
=10^(2n)

99 ^ 2 + 199 of 99 ^ 2 + 99 =?

(99 & (178; + 99)) (99 & (178; + 199)
=[99 × (99 + 1)] (99 & # 178; + 99 + 100)
=(99 × 100) of (99 × 100 + 100)
=(99 × 100) [100 × (99 + 1)]
=(99 × 100) (100 × 100)
=100 out of 99

1999+199+19+9=?

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