A simple algorithm of multiplying 99 by 34

A simple algorithm of multiplying 99 by 34

99x34
=(100-1)x34
=100x34-34
=3400-34
=3366

How to square a door

It depends on what door it is
Rectangle: length * width
Square: side length * side length
Circle: 3.14 * radius * radius

PEP primary school English grade 3 Volume 2 midterm paper

2 √ 5 =? How much?

It can't be simplified. Root five is about 1.732

Scenery in my eyes

Maybe it's the pressure of junior high school life, maybe it's the unique characteristics of youth. Since junior high school, whenever I'm alone, facing the dark night, there is a kind of inexplicable sadness, there is an impulse to cry, although I'm a little man. Knowing this kind of psychological disadvantage, I found my father and asked him to accompany me to climb a mountain

1. The distance between a and B is 500 kilometers. Two cars leave from a and B at the same time. Can the bus travel 85 kilometers per hour and the truck 49 kilometers per hour?
2. Class one of grade five performs in line. There are 12 or 16 students in each line. It is known that there are less than 50 students in this class. Can you calculate the number of students in this class?

S = (85 + 49) * 3 = 402

The root of equation lgx = 4-x x0 ∈ (k, K + 1) k ∈ znak=

Let f (x) = lgx - 4 + X
f(1)=lg1-4+1=-3

Simple operation: (2 + 4 + 6 + 8 +. + 1998 + 2000) - (1 + 3 + 5 + 7 +. + 1997 + 1999)

(2 + 4 + 6 + ~ + 2000) - (1 + 3 + 5 + ~ + 1999) is essentially 2-1 + 4-3 + 6-5 + ~ + 2000-1999. It is actually the sum of 1000 ones, so the result is 1000

Why is the final result of x27 24 + 4 = 28,
The first answer is still not very clear. Why is 4x27 out of 27 4? How about this one? If your answer helps me,

Multiplicative distributive law
=8x27 / 9 + 4x27 / 27
=3X8+4
=24+4
=28

The price of a commodity is increased by 10% and then decreased by 10%. The current price is compared with the original price ()
A. Same amount B. more than original price C. less than original price

1 × (1 + 10%) × (1-10%), = 1.1 × 0.9, = 99%, the current price is equivalent to 99% of the original price, less than the original price