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uranmaximum [27]
3 years ago
6

Evaluate 0.212121... + 0.021021021... − 0.145714571457...

Mathematics
1 answer:
Alexandra [31]3 years ago
7 0

Finding the exact value of each number goes like this:

<em>x</em> = 0.212121...

100<em>x</em> = 21.212121...

==>  100<em>x</em> - <em>x</em> = 21.212121... - 0.212121...

==>  99<em>x</em> = 21

==>  <em>x</em> = 21/99 = 7/33

Similarly:

<em>y</em> = 0.021021021...

1000<em>y</em> = 21.021021021...

==>  999<em>y</em> = 21

==>  <em>y</em> = 21/999 = 7/333

and

<em>z</em> = 0.145714571457...

10000<em>z</em> = 1457.145714571457...

==>  9999<em>z</em> = 1457

==>  <em>z</em> = 1457/9999

Then we end up with

<em>x</em> + <em>y</em> - <em>z</em> = 32345/369963

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