Question

2)se x1/2 e y=2/3 calcule os valores da expressoa
a)x2+y2-1
c)x3 - y-2
d)x4 -x2-y

Answer 1

2)se x1/2 e y=2/3 calcule os valores da expressoa

a)x2+y2-1

(1/2)² + (2/3)² - 1

1²/2² + 2²/3² - 1

1/4 + 4/9 - 1 soma com fração faz mmc = 4x9 = 36

9(1) + 4(4) - 36(1)

----------------------------

36

9 + 16 - 36

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36

25 - 36

------------

36

-11

------- = - 11/36

36

c)x3 - y-2

(1/2)³ - 2/3 - 2

1³/2³ - 2/3 - 2

1/8 - 2/3 - 2 mmc = 8x3 = 24

3(1) - 8(2) - 24(2)

------------------------------

24

3 - 16 - 48

--------------

24

3 - 64

--------

24

-61

--------- = - 61/24

24

d)x4 -x2-y

(1/2)⁴ - (2/3)² - 2/3

1⁴/2⁴ - 2²/3² - 2/3

1/16 - 4/9 - 2/3 mmc = 16x9 = 144

9(1) - 16(4) - 48(2)

---------------------------

144

9 -64 - 96

-----------------

144

9 - 160

-----------

144

-151

-------- = - 151/144

144

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