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a) \(9+4\sqrt{5}=\left(\sqrt{5}\right)^2+2.\sqrt{5}.2+2^2=\left(\sqrt{5}+2\right)^2\)
b) \(23-8\sqrt{7}=4^2-2.4.\sqrt{7}+\left(\sqrt{7}\right)^2=\left(4-\sqrt{7}\right)^2\)
c) \(4-2\sqrt{3}=\left(\sqrt{3}\right)^2-2.\sqrt{3}.1+1^2=\left(\sqrt{3}-1\right)^2\)
d) \(11+6\sqrt{2}=3^2+2.3.\sqrt{2}+\left(\sqrt{2}\right)^2=\left(3+\sqrt{2}\right)^2\)
a) \(9+4\sqrt{5}=\left(\sqrt{5}+2\right)^2\)
b) \(23-8\sqrt{7}=\left(4-\sqrt{7}\right)^2\)
c) \(4-2\sqrt{3}=\left(\sqrt{3}-1\right)^2\)
d) \(11+6\sqrt{2}=\left(3+\sqrt{2}\right)^2\)
\(a,=\left(\sqrt{6}+\sqrt{5}\right)^2\\ b,=\left(\sqrt{7}-\sqrt{3}\right)^2\\ c,=\left(\sqrt{3}+\sqrt{5}\right)^2\\ d,=\left(2+\sqrt{3}\right)^2\\ e,=\left(2\sqrt{2}-1\right)^2\)
a: \(=\left(\sqrt{6}+\sqrt{5}\right)^2\)
b: \(=\left(\sqrt{7}-\sqrt{3}\right)^2\)
A = ((20 + 1) . 20 : 2) . 2 = 420
B = (25 + 20) . 6 : 2 = 135
C = ( 33 + 26) . 8 : 2 = 236
D = (1 + 100) .100 : 2 = 5050
\(A=99...95^2\\ B=99...99^2\\ C=66...67^2\\ D=33...35^2\)