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7. There is a kind of operation symbol "...", which is known as "a" * b = 2A + B. the calculation of 5 ＊ (3 ＊ 2) = ()
Eighteen
It is specified that * is an operation symbol and a * b = ab-2a. Try to calculate the value of 4 * (- 2 * 3)
First: - 2 * 3 = - (2x3-2x2) = - 2
Secondly, 4 * (- 2) = 4x (- 2) - 2x4 = - 8-8 = - 16
Principle, the number after the replacement of the previous equation
Define "&" as an operation symbol Make 5 & 3 = 7; 3 & 5 = 1; 8 & 4 = 12; 3 & 4 = 2?
5&3=7=5+5-3=7
3&5=1=3+3-5=1
8&4=12=8+8-4=12
3&4=2=3+3-4=2
7&2=7+7-2=12
If an operation symbol * is defined as: a * b = a + b-ab-1, the operation symbol @ is defined as a@b=a The square of ab-b + the square of ab-b, calculation: 2*（ 3@4 ）The result is? emergency
The final result is - 4
Calculate first 3@4=3 Multiply 3 + 3 times 4-4 times 4 = 9 + 12-16 = 5
Calculate 2 * 5 = 2 + 5-2 times 5-1 = - 4
The operation symbol "⊙" is defined as a ⊙ B = a × B / A + B, then the value of 10 ⊙ (10 ⊙ 10) is ⊙
When a ⊙ B = a × B / (a + b), it is suspected that the numerator is ab. the denominator of a + B10 ⊙ (10 ⊙ 10) = 10 ⊙ 5 = 10 × 5 / (10 + 5) = 10 / 3 a ⊙ B = a × B / A + B. this formula means that ab divided by a and added B is equal to a + B10 ⊙ (10 ⊙ 10) = 10 ⊙ 20 = 10 + 20 = 30
It is known that a and B are rational numbers. A * b = a minus B / AB is defined. Please find the value of 2 * [3 * (- 2)] according to the meaning of the operation symbol '*'. Thank you
3*(-2)
In other words, a = 3, B = - 2 is substituted
So 3 * (- 2) = [3 - (- 2)] / [3 × (- 2)] = 5 / (- 6) = - 5 / 6
SO 2 * [3 * (- 2)] = 2 * (- 5 / 6)
In other words, a = 2, B = - 5 / 6 is substituted
SO 2 * [3 * (- 2)] = [2 - (- 5 / 6)] / [2 × (- 5 / 6)] = (17 / 6) / (- 10 / 6) = - 17 / 10
If the sign * means a * B is equal to a + b-2a + B of AB, find the value of [2 * - 3] * - 1
2＊（-3）=（2-3-2*2-3）/（-6）=4/3
4/3＊（-1）=（4/3-1-2*4/3-1）/（-4/3）=5/2
If the meaning of the symbol "*" is a * b = ab A + B, find the value of 2 * - 3 * 4 () A. 12 B. -12 C. 12 Five D. −12 Five
According to the meaning of the title: 2 * (- 3) = 2 × (− 3)
2−3=6，
Then 2 * - 3 * 4 = 6 * 4 = 24
10=12
5．
Therefore, C
If the meaning of the symbol "* B" is a * b = ab of a + B, what is the value of 2 ＊ (- 3) × 4
In other words, a = 2, B = - 3
SO 2 ＊ (- 3)
=2×(-3)/[2+(-3)]
=6
So on the circle = 6 * 4
=6×4/（6+4）
=2.4
If the meaning of the symbol "*" is a * b = ab A + B, find the value of 2 * - 3 * 4 () A. 12 B. -12 C. 12 Five D. −12 Five
According to the meaning of the title: 2 * (- 3) = 2 × (− 3)
2−3=6，
Then 2 * - 3 * 4 = 6 * 4 = 24
10=12
5．
Therefore, C
RELATED INFORMATIONS
- 1. If the meaning of the symbol "*" is a * b = ab of a + B, find the value of 2 * (- 3)
- 2. The algorithm for the multiplication of rational numbers is
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- 10. In a right triangle, what is the relationship between the three trigonometric functions of an acute angle and why
- 11. Let A. B be a rational number. If we define the operation symbol "* B" as the square of a - the square of B = a = 2B, when we ask what the value of X is, the value of formula x * X-2 is 9
- 12. How many zeros does the factorial of 1000 have
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- 14. Proof: 1 / (1 + 1)! + 2 / (2 + 1)! + +n/(n+1)=1-1/(n+1)! Verification: 1 / (1 + 1)! + 2 / (2 + 1)! + +n/(n+1)=1-1/(n+1)!
- 15. Let m, M + 1 and M + 2 be the three sides of an obtuse triangle, then the value range of real number m is () A. 0＜m＜3 B. 1＜m＜3 C. 3＜m＜4 D. 4＜m＜6
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- 19. Force analysis diagram of the object in the equator! Force analysis of the equatorial object!
- 20. As shown in the figure, it is a long enough inclined plane with a dip angle of θ = 37 ° and a mass of M = 10kg. Under the action of a force of F = 100 N along the inclined plane at the bottom of the inclined plane, the body moves from rest to 4m in 2S, and the force F is removed at the end of 2S, (sin 37 ° = 0.6, cos 37 ° = 0.8, 2) find: (1) the dynamic friction coefficient μ between the object and the inclined plane; (2) the velocity V of the object at the end of 1.5 s from the removal force F; (3) when the object passes 4.5 m away from the bottom of the slope