Simplified operation of 36 times 198

Simplified operation of 36 times 198

36×198=36×﹙200－2﹚＝7200－72=7128

20+20（x+1）+20（x+1)²=95.

20+20（x+1）+20（x+1)²=95
1+（x+1）（x+1)²=4.75
x²+3x-1.75=0
(x+3.5)(x-0.5)=0
x=-3.5 x=0.5

1 = 5, 2 and 7, 2 = 7, 12, 43 = 12, 11, 8 = 32, 60, 15 = 20

1 equals five fifths, 2 and 7 / 2 = 7 / 16, 12 / 43 = 3 and 12 / 7, 11 / 8 = 44 / 32, 60 / 15 = 20 / 45, 4 / 3 = 12 / 9. Why don't you know this? What grade are you in? I don't know if I miscalculate. It's better to recalculate

On my first day of junior high school, how to do the factorization of a & # 178; - B & # 178; + A + B? By the way, I know nothing about factorization

=(a-b)(a+b)+(a+b)=(a-b)(a+b+1)

The sum of five and eleven twelve plus six minus one twelfth and the difference of five and five plus seven and four minus one and three fifths multiplied by five and twelve eleven
This is my homework

Five and eleven twelve? Isn't it six and eleven one? You didn't copy the wrong question, did you
[（5 12/11+6-1/12）（5 1/5+7.4-1 3/5）]*5 11/12?
A: 112535 / 144 and 781 and 71 / 144

A 2-meter-long cuboid wood is sawn into three sections on average, and the surface area is increased by 400 square meters. The original volume of this wood is () cubic meters?
It's the original volume!

The wood is sawed into three sections, and four bottom surfaces are added. The bottom area of the wood is 400 / 4 = 100 square meters, and the volume of the cuboid is = bottom area × height
So the original volume of this wood is 100 × 2 = 200 cubic meters

A six digit 23a56a is a multiple of 88. What is the quotient of this number divided by 88?
How many four digits can be divided by 11 into Yu 8 by 1, 9, 8 and 8?

A six digit 23a56a is a multiple of 88. The quotient of this number divided by 88 is 2620 when a = 0 and 2711 when a = 8

Given that the sequence {an} satisfies A1 = 1, an + 1 = 3an + 3N, find an

∵ an + 1 = 3an + 3N, ∵ an + 13N + 1-an3n = 13, ∵ sequence {an3n} is an arithmetic sequence with 13 as the first term and 13 as the tolerance, ∵ an3n = 13 + 13 (n-1) = 13N, ∵ an = n · 3n-1

-35 out of 99 by 19

Mental arithmetic?
Yes, change - (99 + 35 / 36) to - (100 - 1 / 36), and then it can be calculated
simple form
=-(100-1/36)*19
=-(1900-19/36)
=-(1899+17/36)
So the answer is - 1899 and 17 out of 36
Welcome to ask~

What is a & # 178; - B & # 178; - C & # 178; + 2Ab

a²+b²-c²+2ab
=(a+b)²-c²
=(a+b+c)(a+b-c)