For example, the English abbreviation of Need to distinguish between case letters! for eg. e.g. For Eg. For eg．? E.G.

For example, the English abbreviation of Need to distinguish between case letters! for eg. e.g. For Eg. For eg．? E.G.

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The division of 2 / 3 △ (- 2 / 3) - 4 / 21x (- 1 and 3 / 4) rational numbers,

The original formula = - 1 - 4 / 21 * (- 7 / 4) = - 1 + 1 / 3 = - 2 / 3

The circumference of a semicircle is 30.84 cm, its radius is () cm, and its area is () square cm

The circumference of the solution semicircle is 2R + π r = 30.84
R=30.84/(2+π)=6cm
Semicircle area = π R ^ 2 / 2
=3.14*6^2/2
=56.52cm^2

As shown in Figure 9, it is an intuitive picture of a triangular prism. The length of its bottom side is 3.5cm, and the length of its side edge is 4cm. What is the side area

3.5 * 4 = 14 square centimeters 14 * 3 = 42 square centimeters

What is the minimum positive period of y = 4sin ^ π x + 1

What is the minimum positive period of y = 4sin ^ π x + 1
The minimum positive period T = 2 π / π = 2;
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Sum 1 / 2-1 / 3 + 1 / 4-1 / 5 + 1 / 6 ------ + 1 / 2N-1 / 2n + 1

Using 1-1 / 2 + 1 / 3-1 / 4 + 1 / 5-1 / 6 + =LN2 then 1 / 2-1 / 3 + 1 / 4-1 / 5 + 1 / 6-1 / 7 + =1-（1-1/2+1/3-1/4+1/5-1/6+……） =1-ln2

In the following sentences, the use of dashes has been explained and the correct one has been chosen
A. "My friend," he said, "I-I-I
B. The bee picks honey happily until the autumn is cool

A

It is known that F1 and F2 are respectively the left and right focal points of the ellipse X & # 178 / 8 + Y & # 178 / 4 = 1, and point P is any point on the ellipse, then the value range of | pf1-pf2 | / Pf1 is

It is easy to know that a = 2 √ 2, B = 2, C = 2, obviously | pf1-pf2 | / Pf1 ≥ 0 if and only if Pf1 = PF2 (i.e. P is at the vertex of the minor axis) obtains the minimum value 0. From the definition of ellipse, we know that Pf1 + PF2 = 2A, i.e. PF2 = 2a-pf1 = 4 √ 2-pf1, so | pf1-pf2 | / Pf1 = | 2-4 √ 2 / Pf1 | and because a-c ≤ Pf1 ≤ a + C, i.e. 2 √ 2-2 ≤ Pf1 ≤ 2 √ 2 + 2, let y =

The perimeter of the rectangle is 80 decimeters, and the ratio of its length to width is 5:3. What is the area of the rectangle

Length + width = 80 △ 2 = 40 decimeters
Length = 40 ÷ (5 + 3) × 5 = 25 decimeters
Width = 40-25 = 15 decimeters
Area = 25 × 15 = 375 square decimeters

What is sin β equal to 15 / 17 and cos β equal to

Because the square of sin β + the square of cos β = 1, you can solve the equation cos β = + - 8 / 17