Question

1.Calculeaza:
a) √8·√2
b) √28·√63
c) √0,28·√0,63
d)√84·√0,63
e) √3,2·√0,8
Repede va rog

Answer 1

√8·√2 = √16 = 4

√28·√63 = √1764 = 42

√0,28·√0,63 = √0,1764 = 0,42

√84·√0,63 = √52,92 = √(5292/100) = (42√3)/10 = (21√3)/5 ≈7,275

√3,2·√0,8 = √2,56 = 1,6

Answer 2

$\sqrt{8} \times \sqrt{2} = \sqrt{8 \times 2} = \sqrt{16} = \sqrt{4 ^{2} } = 4 \\ \\ \sqrt{28} \times \sqrt{63} = \sqrt{28 \times 63} = \sqrt{1764} = \sqrt{ {42}^{2} } = 42 \\ \\ \sqrt{0,28} \times \sqrt{0,63} = \sqrt{0,28 \times 0,63} = \sqrt{0,1764} = 0,42 \\ \\ \sqrt{84} \times \sqrt{0,63} = \sqrt{84 \times 0,63} = \sqrt{52,92} = 7,27461339178928 \\ \\ \sqrt{3,2} \times \sqrt{0,8} = \sqrt{3,2 \times 0,8} = \sqrt{2.56} = 1,6$