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Hatshy [7]
3 years ago
7

(a+b)(a-b)=? Đây là hằng đẳng thức nào?

Mathematics
2 answers:
allsm [11]3 years ago
8 0

Answer:

không

Step-by-step explanation:

mash [69]3 years ago
6 0

Answer:

(a + b)(a - b) = a² - b²

Step-by-step explanation:

(a + b)(a - b) = a (a - b ) + b (a - b )

                 = a²  - ab + ba  - b²             [ ab = ba ]

                 = a² - ab + ab - b²               [ ab - ab = 0 ]

                 = a² - b²

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Answer:

          [ry, yr, gy, yg, rg, gr]-Any three picks from this sample space.

Step-by-step explanation:

-The bag contains exactly 1r, \ 1y, \ 1g \ marbles.

-He picks one ball without looking, and chooses a second ball without replacing the first:

  • If the first is red, the the second is either yellow or green,
  • If the first is a yellow, then the second can be red or green,
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The sample space of the second pick is therefore:

                               [ry, yr, gy, yg, rg, gr]

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3 years ago
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A≈113.1

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5/6

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Step-by-step explanation:

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Bobby has already ran 1 mile on his own, and he expects to run 1 mile during each track practice. How many track practices would
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Answer:

In order to have ran 33 miles, Bobby would have to attend <em>32 track practices.</em>

Step-by-step explanation:

Solving this problem entails of uncovering the amount of track practices Bobby must attend in order to have ran 33 miles. Start by reading the problem carefully to break down the information provided.

You can see that Bobby has already ran one mile on his own. This is important to remember for later. The problem also states that he expects to run one mile at every track practice.

Setting up an equation will help us solve. Here is how we could set up the equation:

(<em>amount of miles already ran</em> = 1) + (<em>number of track practices</em> = x) = (<em>total miles to run</em> = 33)

1 + x = 33

The equation is now in place. You can solve this, or isolate <em>'x',</em> by using the subtraction property of equality. This means we will subtract one from both sides of the equation, thus isolating the variable.

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The variable is the only term left on the left side of the equation. This means Bobby must attend track practice <em>32 times</em> in order to have ran 33 miles.

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