The area of Lele's room is 15.4 square meters. The floor is paved with 0.4 meter long square bricks, and 100 such bricks are prepared,

The area of Lele's room is 15.4 square meters. The floor is paved with 0.4 meter long square bricks, and 100 such bricks are prepared,

15.4 ÷ (0.4 × 0.4) = 96.25 pieces
It's enough to prepare 100 such square bricks

The 56 flowers in Chinese youth refer to

1. Han nationality 1159.4 million 2. Zhuang nationality 16178811 3. Manchu nationality 10682263 4. Hui nationality 9816802 5. Miao nationality 8940116 6. Uygur nationality 8399393 7. Tujia nationality 8028133 8. Yi nationality 7762286 9. Mongolian nationality 5813947 10. Tibetan nationality 5416021

What is sin a multiplied by cos a

(sin 2a)/2

If the perimeter of the triangle surrounded by three median lines of the triangle is 5cm, the original triangle will be formed
Then the perimeter of the original triangle is

If the perimeter of the triangle surrounded by three median lines is 5 cm, the perimeter of the original triangle is 5 × 2 = 10 cm

The value range of the function y = │ x │ + 4 / │ x │ is
A. [4, positive infinity] B. [2, positive infinity] C. (negative infinity, 0) U (0, positive infinity) d. (negative infinity, - 4]
I use the basic inequality when x is negative, 0, positive,
I don't think there's an answer in the choice
I think it's OK, but it doesn't seem to have this option,
That's when x is negative
y=-x-4/x=-(x+4/x)
Because x + 4 / x > = 4, so - Y > = 4, so y

Mean inequality
y=│x│+4/│x│=>2√4=4
So it's a

We help to find the differential of y = 8x ^ x-6e ^ 2x function

y=8e^(xlnx)-6e^(2x)
y'=8e^(xlnx)* (lnx+1)-12e^(2x)=8x^x(lnx+1)-12e^(2x)
dy=[8x^x(lnx+1)-12e^(2x)]dx

After the length and width of a rectangular vegetable field are increased by 5 meters, the area of the rectangular vegetable field is increased by 105 square meters. At this time, how many meters is the perimeter of the rectangle?

Let the length and width of the original rectangular vegetable field be a meter and B meter, then the area is ab square meter. After the length and width are increased by 5 meters, the area is (a + 5) (B + 5) = AB + 5 (a + b) + 25, then the increased area is ab + 5 (a + b) + 25 - AB = 5 (a + b) + 25 = 105, then the area is a + B + 5 = 21, so a + B = 16. After the length and width are increased by 5 meters, the perimeter is 2 (a + 5) + 2 (B + 5) = 2 (a + b) + 20 = 2x16 + 20 = 52 (m). A: at this time, the perimeter of the rectangle is 52 meters

The 8th power of 9 × the 2nd power of 27 △ the 8th power of (- 3) (steps needed) great gods help

= 16 power of 3 × 6 power of 3 △ 8 power of (- 3) = (14 power of 3)
Adopt

The minimum positive period of function y = cos ^ 2 + 1

y=cos^2+1
=(cos2x+1)/2+1
=(1/2)cos2x+3/2
The minimum positive period is
2π/2=π

A square tablecloth with a side length of 80 cm just covers the area of a round tabletop?

The diameter of the circle is 80cm, the radius is 0.4m, and the area is 3.14 × 0.4 × 0.4 = 0.5024m2