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If the base of a triangle is (2a + 6b) and the height is (4a-5b), then the area of the triangle is:
Area = 1 / 2 * (2a + 6b) * (4a-5b)
=(a+3b)*(4a-5b)
If the teacher wants to break down the answer, then here it is
If we want to open up, then it is the following
Area = 1 / 2 * (2a + 6b) * (4a-5b)
=(a+3b)*(4a-5b)
=4a^2+12ab-5ab-15b^2
=4a^2+7ab-15b^2
If a is greater than 0, the absolute value of a / a = A / a = 1, if a is less than 0, the absolute value of a / a = A / - a = - 1. Please calculate the absolute value of a / a plus the absolute value of B / B according to the information given
All possible values of the absolute value of C / C
The absolute value of a / A, B / B and C / C,
If all three are positive numbers, you get 3,
If all three are negative, we get - 3,
If there are two positive numbers and one negative number, we get 1,
One positive number, two negative numbers, then - 1,
A square iron plate, side length is 20 cm, cut out the largest triangle, the triangle area is a few square centimeters?
20 × 20 △ 2 = 200 cm and 178;
When a is less than B and less than 0, what is the absolute value of a plus B minus a minus B
Because a
1. The base length of a triangle is (a + 6b) and the height is (4a-5b). What is the area of this triangle?
2. When a = -- 2, the value of the algebraic formula (B-A) (a + b) (A & sup2; + B & sup2;) - (the fourth power of a + the fourth power of B) is?
The following statement is correct ()
A. The sum of two numbers cannot be less than one of the addends. B. adding two numbers means adding their absolute values. C. adding two negative numbers and taking a negative sign, subtracting their absolute values. D. adding two numbers that are not opposite to each other cannot get zero
A. When two numbers are different signs, the sum of two numbers must be less than one of the addends, so this option is wrong; B, the addition of two different signs is not the addition of their absolute values, so this option is wrong; C, the addition of two negative numbers, and take a negative sign, so this option is wrong; D, two numbers that are not opposite to each other, can not get zero, this option is correct
The lengths of two sides of a triangle are a + B and 2a-b respectively, and the perimeter of a triangle is 4A + 0.5B (a > b)
1. Find the length of the third side of the triangle; 2. When a = 3, B = 2, write out the length of each side of the triangle
The length of the third side of the triangle = 4A + 0.5B - (a + b) - (2a-b) = a + 0.5B when a = 3, B = 2, a + B = 5, 2a-b = 6-2 = 4, a + 0.5B = 3 + 1 = 4
If the sum of two numbers with different signs is positive, then______ If the sum is negative, then______ If the sum is 0, the absolute value of the two numbers is greater______ ．
If the sum of two different sign numbers is positive, the absolute value of positive number is larger. If the sum is negative, the absolute value of negative number is larger. If the sum is 0, the absolute value of the two numbers is equal
Numbers with negative signs are negative
No, when A0 is positive
Are all numbers with negative signs negative?
The number with the sign is not necessarily negative, it may be positive
For example - (- 1)
RELATED INFORMATIONS
- 1. It is known that the first side of a triangle is (2a + b) cm, the second side is (a-b) cm longer than the first side, and the third side is ACM shorter than the first side (1) The length of the second side is () cm, and the length of the third side is () cm (2) : find the perimeter of the triangle
- 2. If the length of one side of a rectangle is 2A + 3b and the length of the other side is a + B smaller than it, then the circumference of the rectangle is? A.a+2b B.4a+5b C.6a+10b D.10a+6b
- 3. If one side of the rectangle is a-2b, and the other side is 2a and B larger than the first side, the perimeter of the rectangle is a-2b_______ I'm in a hurry!
- 4. If one side of a rectangle is 2A + B, and the other side is a − 12b larger than it, then the circumference of the rectangle is () A. 10a+3bB. 5a+bC. 7a+bD. 10a-b
- 5. Put the rectangle 2 cm in length and 1 cm in width as shown in the figure in one, two, and three layers, and finish the 15th layer. What is the circumference of this figure______ Cm
- 6. The circumference of an isosceles triangle is known to be 20 (1) If the waist length is seven, the bottom length is (2) the bottom length is seven, and the waist length is (3) if the length of one side is seven, and the length of the other two sides is?
- 7. In the triangle ABC, the lengths of the three sides are a, B, C, a = n ^ 2-1, B = 2n, C = n ^ 2 + 1 (n is an integer greater than 1). Which side is right
- 8. The lengths of three sides of triangle ABC are a, B, C, and a > b > C, ABC are positive integers, satisfying the condition of 1 / A + 1 / B + 1 / C = 1. Try to judge whether triangle ABC exists, and explain the reason
- 9. It is known that the lengths a, B and C of △ ABC are integers, and satisfy a > b > C, a = 7?
- 10. In the acute triangle ABC, the lengths of three sides a, B and C are all integers, and a is less than B and less than C, a + B + C = 20
- 11. The perimeter of a rectangle is 4A + 4B. If one side of the rectangle is represented by a, what is the area of the rectangle?
- 12. The area of a rectangle is 4A ^ 2-2ab + (1 / 4) B ^ 2, one side of which is 4a-b, its perimeter is?
- 13. The known set a = {0, a}, B = {B | B ^ 2-3b
- 14. A nonnegative integer with an absolute value less than 3 is___ ．
- 15. All nonnegative integers with absolute values less than 3.1
- 16. What is the sum of all integers with absolute values greater than 3 but less than 6
- 17. The sum of three continuous natural numbers is 21. The product of these three continuous natural numbers is______ ．
- 18. If 1 / a > 1, then a
- 19. Say the inverse proposition of the proposition "in the rectangular coordinate system, the point (x, y) and the point (- x, - y) are symmetrical about the origin", and judge the truth of the inverse proposition
- 20. If two numbers are added, the result is one of the two numbers, then the other addend is a. a positive number B. a negative number C. zero D. a positive number negative or zero