Question

срочно!

$sqrt{7} times sqrt{63} = {?}$

$sqrt{8} times sqrt{98} =$

$sqrt{75} times sqrt{3} =$

Answer 1

$sqrt{7} times sqrt{63} = sqrt{7 times 7 times 9} = 7 times 3 = 21 \ sqrt{8} times sqrt{98} = sqrt{8 times 2 times 49} = sqrt{16 times 49} = 4 times 7 = 28 \ sqrt{75} times sqrt{3} = sqrt{25 times 3 times 3} = 5 times 3 = 15$