Bonjour,
7 :
a) √7×√6
[tex]\sqrt{7} \times \sqrt{6} \\ = \sqrt{7 \times 6} \\ = \sqrt{42}[/tex]
b) √15/√5
[tex]\frac{ \sqrt{15} }{ \sqrt{5} } \\ = \frac{ \sqrt{15 \div 5} }{ \sqrt{5 \div 5} } \\ \frac{ \sqrt{3} }{ \sqrt{1} } \\ = \frac{ \sqrt{3} }{1} \\ = \sqrt{3}[/tex]
c) √16+√9
[tex]\sqrt{16} + \sqrt{9} \\ = 4 + 3 \\ = 7 \\ = \sqrt{49}[/tex]
d) 4√3
[tex]4 \sqrt{3} \\ = \sqrt{3 \times 16} \\ = \sqrt{48} [/tex]
8 :
a) √50
[tex]\sqrt{50 } \\ = \sqrt{5 ^{2} \times 2 } \\ = \sqrt{5^{2} } \sqrt{2} \\ = 5 \sqrt{2}[/tex]
b) √200
[tex]\sqrt{200} \\ = \sqrt{10^{2} \times 2 } \\ = \sqrt{10^{2} } \sqrt{2} \\ = 10 \sqrt{2}[/tex]
c) √147
[tex]\sqrt{147} \\ = \sqrt{7^{2} \times 3 } \\ = \sqrt{7^{2} } \sqrt{3} \\ = 7\sqrt{3}[/tex]
d) 2√54
[tex] 2 \sqrt{54} \\ = 2 \sqrt{3^{2} \times 6 } \\ = 2 \sqrt{3^{2}} \sqrt{6} \\ = 2 \times 3 \sqrt{6} \\ = 6 \sqrt{6} [/tex]
