а) [tex]8 \sqrt{3} \times \sqrt{3} = 8 \times 3 = 24[/tex]б) [tex]-6 \sqrt{5} \times 2 \sqrt{5} = -6 \times 2 \times 5 = -60[/tex]в) [tex]-\sqrt{13} \times 4 \sqrt{13} = -13 \times 4 = -52[/tex]г) [tex]5 \sqrt{7} \times (-0.2 \sqrt{7}) = 5 \times (-0.2) \times 7 = -7[/tex]
а) [tex]\sqrt{41^{2} - 40^{2}} = \sqrt{1681 - 1600} = \sqrt{81} = 9[/tex]б) [tex]\sqrt{178^{2} - 78^{2}} = \sqrt{31684 - 6084} = \sqrt{25600} = 160[/tex]в) [tex]\sqrt{8.2^{2} - 1.8^{2}} = \sqrt{67.24 - 3.24} = \sqrt{64} = 8[/tex]г) [tex]\sqrt{6.5^{2} - 5.2^{2}} = \sqrt{42.25 - 27.04} = \sqrt{15.21} = 3.9[/tex]
а) [tex]7 \sqrt{2} \times \sqrt{18} = 7 \times \sqrt{2} \times \sqrt{9} = 7 \times 2 \times 3 = 42[/tex]б) [tex]5 \sqrt{7} \div (\frac{1}{7} \sqrt{28}) = 5 \times 7 \times \frac{1}{7} = 5 \times \sqrt{4} = 10[/tex]в) [tex]4 \sqrt{8} \times 0.01 \sqrt{18} = 4 \times 2 \times 0.01 \times 3 = 0.24[/tex]
а) [tex]8 \sqrt{3} \times \sqrt{3} = 8 \times 3 = 24[/tex]
б) [tex]-6 \sqrt{5} \times 2 \sqrt{5} = -6 \times 2 \times 5 = -60[/tex]
в) [tex]-\sqrt{13} \times 4 \sqrt{13} = -13 \times 4 = -52[/tex]
г) [tex]5 \sqrt{7} \times (-0.2 \sqrt{7}) = 5 \times (-0.2) \times 7 = -7[/tex]
а) [tex]\sqrt{41^{2} - 40^{2}} = \sqrt{1681 - 1600} = \sqrt{81} = 9[/tex]
б) [tex]\sqrt{178^{2} - 78^{2}} = \sqrt{31684 - 6084} = \sqrt{25600} = 160[/tex]
в) [tex]\sqrt{8.2^{2} - 1.8^{2}} = \sqrt{67.24 - 3.24} = \sqrt{64} = 8[/tex]
г) [tex]\sqrt{6.5^{2} - 5.2^{2}} = \sqrt{42.25 - 27.04} = \sqrt{15.21} = 3.9[/tex]
а) [tex]7 \sqrt{2} \times \sqrt{18} = 7 \times \sqrt{2} \times \sqrt{9} = 7 \times 2 \times 3 = 42[/tex]
б) [tex]5 \sqrt{7} \div (\frac{1}{7} \sqrt{28}) = 5 \times 7 \times \frac{1}{7} = 5 \times \sqrt{4} = 10[/tex]
в) [tex]4 \sqrt{8} \times 0.01 \sqrt{18} = 4 \times 2 \times 0.01 \times 3 = 0.24[/tex]