A cuboid wood, its cross-sectional area is 0.25 square meters, the length is 3 meters?

A cuboid wood, its cross-sectional area is 0.25 square meters, the length is 3 meters?

0.25x3x6 = 4.5m3

How to convert one foot and one inch? How many centimeters are they?

In Han Dynasty, one foot is equal to 23.1cm, in Wei and Jin Dynasties, 26.7cm in Sui and Tang Dynasties, and 30.72cm in song and Yuan Dynasties. Ten feet is one foot. Ten inches is one foot. Generally speaking, one foot is 333.333cm, one foot is 33.3333cm, and one inch is 3.333cm

1. What is the quotient of the sum of 1 / 6 and his reciprocal divided by the difference between 5 / 6 and 3 / 4

1；74
2,13.5

If the values of formula 3x-2 and X-1 are opposite to each other, then the value of X is -

Three quarters

Calculation 1 / 3 + 1 / 15 + 1 / 35 + 1 / 63 + 1 / 99 + 1 / 143 + 1 / 195 + 255 + 1 / 323 + 1 / 399

2*（1/3+1/15+1/35+1/63+1/99+1/143+1/195+1/255+1/323+1/399）=2/3+2/15+2/35+2/63+2/99+2/143+2/195+2/255+2/323+2/399=(1-1/3)+(1/3-1/5)+(1/5-1/7)+(1/7-1/9)+(1/9-1/11)+(1/11-1/13)+(1/13-1/15)+(1/15-1/17)+(...

What is the minimum natural number greater than 1000 with only three divisors

1001 ＝ 7 × 11 × 13

Given that the minimum value of function y = - x ^ 3 - 3x ^ 2 + 9x-1 on [- 3, a] is - 77, then a=

Y = - X & sup3; - 3x & sup2; + 9x-1. Y '= - 3x & sup2; - 6x + 9 is derived from y' = 0. = = = > - 3x & sup2; - 6x + 9 = 0. = = = > X1 = - 3, X2 = 1. = = = > y increases on [- 3,1], and decreases on [1, + ∞). Y (- 3) = - 28 ≠ - 77. Y (4) = - 64-48 + 36-1 = - 77. So a = 4

How to calculate (1-1 / 50) (1 / 49-1) (1-1 / 48) (1 / 47-1)... (1-1 / 4) (1 / 3-1)

（1-1／50）（1／49-1）（1-1／48）（1／47-1）...（1-1／4）（1／3-)
=49/50*48/49*47/48*46/47*.4/5*3/4*2/3
=2/50
=1/25

Lim3 ^ nsin (x / 3 ^ n)
3 ^ n is the nth power of 3
A method without derivation

Take the derivative first and then calculate

437x437x437 -- what is the remainder of x437-40 divided by 23?
Because 437 can be divisible by 23, its nth power can also be divisible by 23, so the remainder of (437-40) divided by 23 is 6

Yes, it can be calculated like this, because 437 can be divided by 23, so no matter how many multiplications can be made. A more general method is (437 * 437... * 437-40) mod 23 = (437 * 437... * 437) mod 23 + (- 40) mod 23mod, which means to take the remainder. Note that - 40 mod 23 is not 40