English abbreviation of ruler (unit of length) What is a meter, a centimeter, a centimeter

English abbreviation of ruler (unit of length) What is a meter, a centimeter, a centimeter

Foot feet (FT)
Chinese ruler has no corresponding word in English
Must be converted to other units (meters, centimeters, feet, inches)

Abbreviation of length unit
All product must be stored off floor, on pallets or racks maintained 18 "from wall?

Inch
Inch "or" in "is inch
Feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet feet
1 inch = 25.4mm

Proof: when m is a real number, at least one of the quadratic equation x2-5x + M = 0 and the equation 2x2 + x-6-m = 0 has a real root

Assuming that the above two equations have no real roots, then △ 1 = 25 − 4m ＜ 0, ① △ 2 = 1 + 4 × 2 × (6 + m) ＜ 0, ② ① get m ＞ 254, ② get m ＜ 498, such that m does not exist. At least one of the equations has a real root

If you divide a number by one fifth, the number will increase four times. Is that right

No, there are still 0

The intersection of circle O1 and circle O2 is a and B, the common chord length is 2.8cm, the radius of circle O1 and circle O2 is 1.8cm and 2.5cm respectively?

2.8/2=1.4
√（2.5²-1.4²）+√（1.8²-1.4²）=√4.29+√1.28≈3.2（cm）

Car a and car B leave 324km apart at the same time. After 6 hours, they meet on the way. The speed of car a is 5 / 4 of that of car B. how many km does car a travel per hour

It is easy to know that the speed of a and B is 324 / 6 = 54
So the speed of a is 54 / (1 + 4 / 5) = 30

If the algebraic formula 1 / 2 * (x ^ 2) * (y ^ 3) - 3 (x ^ m) * y ^ (n-1) + XY ^ 2 is a binomial, find the value of the algebraic formula [(m-n) ^ 2] + 2mn-2 (m-n) ^ 2

1 * (x ^ 2) * (y ^ 3) - 3 (x ^ m) * y ^ (n-1) + XY ^ 2 = 1 / 2x ^ 2Y ^ 3-3x ^ my ^ (n-1) + XY ^ 2 according to the topic meaning M = 2, n-1 = 3, i.e. n = 4 or M = 1, n-1 = 2, i.e. n = 3 [(m-n) ^ 2] + 2mn-2 (m-n) ^ 2 = 2Mn - (m-n) ^ 2 when m = 2, n = 4, the algebraic formula is 2 × 2 × 4 - (2-4) ^ 2 = 16-4 = 12 when m = 1, n = 3

(- 0.75) divided by 5 / 4 divided by (- 0.3)

(-0.75)÷ 5/4÷（-0.3）
=（-3/4）×4/5×（-10/3）
=（-3/5）×（-10/3）
=2

Given the function FX = 2sinwxcoswx-2sinwx + 1, w > 0, find W
If the minimum positive period of FX is Wu, find the value of W

The formula of double angle: sin2a = 2sinacosa obtains 2sinacosa = sin2acos2a = cos & # 178; a-SiN & # 178; a = (1-sin & # 178; a) - Sin & # 178; a = 1-2sin & # 178; a obtains 2Sin & # 178; a = 1-cos2a, so f (x) = 2sinwxcoswx-2sin & # 178; Wx + 1 = sin2wx - (1-cos2wx) + 1 = sin2wx + Co

-3, - 3, - 7,7. Adding the sign of addition, subtraction, multiplication and division equals 24

[(-3)/(-7)-(-7)]*7=24