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A new operation is defined as X & y = (x + 1) (Y-2) (1) calculation: - 2 & 2 (2) if X & 5 = 12, find the value of X & the sign is a multiplication sign A new operation is defined as X & y = (x + 1) (Y-2) (1) Calculation: - 2 & 2 (2) if X & 5 = 12, find the value of X &This symbol is a multiply sign with a circle outside
(1) : 0, (2) x = 3
A new operation is defined as X & y = (x + 1) (Y-2) (1) calculation: - 2 & 2 (2) if X & 5 = 12, find the value of X & the sign is a multiplication sign
Just take the numbers in
（1）=0
（2）x=3
What are the meanings of the numbers in "wire rope with 4 times sign 7 (symbol of diameter) 5"
What are the meanings of the numbers in "4 × 7 Ф 5 wire rope"?
What are the meanings of the numbers in "steel pipe of Ф 219 × 8"?
There are 1.4 × 7 Ф 5 4 round strands, each of which has 7 outer strands. The nominal diameter of Ф 5 is 5mm
2. Ф 219 × 8 is a steel pipe with 219mm outer diameter and 8mm wall thickness
1. It is known that AB is opposite to each other, CD is reciprocal to each other, and the absolute value of X is 1. Find the value 2 of 3x - [(a + b) + CD] x, and define the meaning of an operation symbol △
: a △ B = AB-1, find the value of 2 △ (- 3), 2 △ [(- 3) - 5]
AB is opposite to each other, CD is reciprocal to each other, and the absolute value of X is 1
Then a + B = 0, CD = 1, x = ± 1
3X－[（a+b﹚+cd]X
=3x-【0+1】x
=3x-x
=2x
=±2
2△（﹣3﹚=2×（-3）-1= -7
2△[﹙﹣3﹚－5]= 2△【-8】=2×（-8）-1= -16-1= -17
RELATED INFORMATIONS
- 1. For the rational number A.B, define and calculate a & B = 3A + B / a-3b, calculate: (- 2) & (7 & (- 6)) & = a sign (plus sign, minus sign, multiplication sign, division sign)
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- 3. One third of a number is 0.5 less than 4. Find the number
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- 5. A number is 60% more than half of 80. To find this number (using the solution of the equation) is very difficult
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- 7. How to solve two equations and three unknowns
- 8. Xiao Ming mistakenly wrote minus two X as plus 2x when solving the equation three a minus two x equals five (x is an unknown number). The solution of the equation is x equals negative five, and the solution of the original equation is X
- 9. Is an equation with unknowns and no solution an equation (such as x = x) It's better to write in detail so that I can understand
- 10. Now, a new operation is defined, for numbers a and B, a} B = a + B / 1-ab. try to calculate (1 / 2} 1 / 5)} 1 / 8
- 11. There are twelve numbers 1,2,3, ····················································································· At least four
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- 13. 48 / x + 4 (48 / 4 of X + 4) + 48 / x-4 (48 / 4 of x-4) = 9
- 14. According to the equation "5 times of X is bigger than half of X"_____ , then x=_____ Brothers and sisters, time does not wait,
- 15. The ratio of length to width of a rectangle is 7:5. If the width is increased by 14 cm, the rectangle will become a square. The area of the original rectangle is___ Square centimeter
- 16. The sum of a number and 3 is 10 less than twice the number?
- 17. 10 is less than 4 times of x 2. How to set up the equation and what is the solution of X
- 18. Three times of X is more than 18
- 19. Two 7-year-old practical problems (solved by equation) 1. Xiaoming and Xiaoli run back to each other along the circular track at the same time. They meet each other every 15 seconds. It is known that Xiaoming runs a lap for 24 seconds, and Xiaoli runs a lap for how many seconds? 2. At present, the concentration of 5% Guozhen beverage is 200g. If the concentration is to be increased to 10%, how much Guozhen should be added to the beverage?
- 20. Practical problems of Grade 7 (solved by equation) 1. Ask the child's age, and answer: "9% less than half of my father's age", ask the father's age, and answer: "3 times older than my child's age", and ask the child's age? 2. The price of a commodity is increased by 50% of the cost price, and then 20% off (80% of the price). The price is 240 yuan. How much is the profit of this commodity? 3. There is a train passing through the first and second tunnels at the speed of 600 meters per minute. It is known that it takes 5 seconds more to pass through the second tunnel than the first tunnel. The length of the second tunnel is twice that of the first tunnel, and it is 50 meters shorter. What is the length of each tunnel? (write steps or equations)