Подстановка условия
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sqrt((a + 3)^2) + sqrt((a - 1*4)^2) при a = 4
__________ __________
/ 2 / 2
\/ (a + 3) + \/ (a - 4)
$$\sqrt{\left(a + 3\right)^{2}} + \sqrt{\left(a - 4\right)^{2}}$$
___________ __________
/ 2 / 2
\/ (-4 + a) + \/ (3 + a)
$$\sqrt{\left(a - 4\right)^{2}} + \sqrt{\left(a + 3\right)^{2}}$$
$$a = 4$$
_____________ ____________
/ 2 / 2
\/ (-4 + (4)) + \/ (3 + (4))
$$\sqrt{\left((4) - 4\right)^{2}} + \sqrt{\left((4) + 3\right)^{2}}$$
___________ __________
/ 2 / 2
\/ (-4 + 4) + \/ (3 + 4)
$$\sqrt{\left(-4 + 4\right)^{2}} + \sqrt{\left(3 + 4\right)^{2}}$$
$$7$$
Рациональный знаменатель
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___________ __________
/ 2 / 2
\/ (-4 + a) + \/ (a + 3)
$$\sqrt{\left(a - 4\right)^{2}} + \sqrt{\left(a + 3\right)^{2}}$$
___________ __________
/ 2 / 2
\/ (-4 + a) + \/ (3 + a)
$$\sqrt{\left(a - 4\right)^{2}} + \sqrt{\left(a + 3\right)^{2}}$$
sqrt((-4 + a)^2) + sqrt((3 + a)^2)
Объединение рациональных выражений
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___________ __________
/ 2 / 2
\/ (-4 + a) + \/ (3 + a)
$$\sqrt{\left(a - 4\right)^{2}} + \sqrt{\left(a + 3\right)^{2}}$$
sqrt((-4 + a)^2) + sqrt((3 + a)^2)