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Презентация, доклад по математике Пропорции
Содержание
- 1. Презентация по математике Пропорции
- 2. express direct and inverse variation in algebraic
- 3. Direct ProportionY is directly proportional to X:That
- 4. Direct Proportione.g. y is directly proportional to
- 5. Direct Proportione.g. y is directly proportional to
- 6. Inverse Proportione.g. y is inversely proportional to x. When x goes up, y goes down.
- 7. Inverse Proportione.g. y is inversely proportional to
- 8. Using direct/inverse proportion to solve problemsMr. Jones
- 9. Using direct/inverse proportion to solve problemsThe power
- 10. Increase and decrease by a given ratioe.g.
- 11. Increase and decrease by a given ratioe.g. decrease 210 by a ratio of 3:7=
- 12. Increase and decrease by a given ratio
- 13. Increase and decrease by a given ratioThis
- 14. THANKS
express direct and inverse variation in algebraic terms use algebra to find unknown quantities in direct/inverse variation problemsincrease and decrease a quantity by a given ratio
Слайд 2express direct and inverse variation in algebraic terms
use algebra to find
unknown quantities in direct/inverse variation problems
increase and decrease a quantity by a given ratio
increase and decrease a quantity by a given ratio
Слайд 3Direct Proportion
Y is directly proportional to X:
That is, y = x
multiplied by a constant:
y ??? x
y = kx
Take an example: 4 = 2x ? k = 2, so y = 2x
Слайд 4Direct Proportion
e.g. y is directly proportional to x.
When x =
2, y = 8. Find x when y = 10.
Слайд 5Direct Proportion
e.g. y is directly proportional to x2.
When x =
2, y = 16. Find x when y = 5.
???
???
???
???
Слайд 7Inverse Proportion
e.g. y is inversely proportional to x2.
When x =
2, y = 1. Find y when x = 1.
???
y = ???
y =
Слайд 8Using direct/inverse proportion to solve problems
Mr. Jones wants to build a
patio. It will take 3 men 72 hours to do it. How long will 5 men take?
Is this direct or inverse proportion?
Is this direct or inverse proportion?
h ???
???
Слайд 9Using direct/inverse proportion to solve problems
The power (P) generated in an
electrical circuit is proportional to the square of the current (I) amps.
When P = 108, I = 6. Find I when P = 75.
When P = 108, I = 6. Find I when P = 75.
???
???
???
???
???
Слайд 10Increase and decrease by a given ratio
e.g. increase 200 by a
ratio of 3:2
“allow three parts for every two”
“allow three parts for every two”
Слайд 13Increase and decrease by a given ratio
This postcard is enlarged by
5:2. What are the new dimensions?
10 cm
16 cm
??? cm
??? cm
