Question

tính

a)\(\sqrt{25}+\sqrt{9}-\sqrt{16}\)

b)\(\sqrt{0,16}+\sqrt{0,01}+\sqrt{0,25}\)

c)\(\left(\sqrt{3^2}\right)-\left(\sqrt{2^2}\right)+\left(\sqrt{5^2}\right)\) d)\(\sqrt{4}-\left(-\sqrt{3}\right)^2+\sqrt{49}\) e)\(\left(2\sqrt{2}\right)^2-\left(3\sqrt{3}\right)^2\)

f)\(\left(-2\sqrt{3}\right)^2+\left(-3\sqrt{2}\right)^2\)

Answer 1

a) \(\sqrt{25}+\sqrt{9}-\sqrt{16}\) = \(\sqrt{5^2}+\sqrt{3^2}-\sqrt{4^2}\) = 5 + 3 - 4 = 4

b) \(\sqrt{0,16}+\sqrt{0,01}+\sqrt{0,25}\) = 0,4 + 0,1 + 0,5 = 1

c) \(\left(\sqrt{3^2}\right)-\left(\sqrt{2^2}\right)+\left(\sqrt{5^2}\right)\)

= 3 - 2 + 5 = 6

d) \(\sqrt{4}-\left(-\sqrt{3}\right)^2+\sqrt{49}\) = 2 - 3 + 7 = 6

e) \(\left(2\sqrt{2}\right)^2-\left(3\sqrt{3}\right)^2\)

= \(\left(\sqrt{8}\right)^2-\left(\sqrt{27}\right)^2\) = 8 - 27 = -19

f) \(\left(-2\sqrt{2}\right)^2+\left(3\sqrt{3}\right)^2\) = 8 + 27 = 35