Question

Помогите по математике

Answer 1

$1)2 sqrt{3} - sqrt{27} +3 sqrt{12} -2 sqrt{243}= 2 sqrt{3}- sqrt{9*3} +3 sqrt{4*3} -2 sqrt{81*3} =$$2 sqrt{3} -3 sqrt{3}+3*2 sqrt{3} -2*9 sqrt{3} =2 sqrt{3} -3 sqrt{3} +6 sqrt{3} -18 sqrt{3} = -13 sqrt{3}$


$3) sqrt{50} -5 sqrt{8} + sqrt{2} + sqrt{128} = sqrt{25*2}-5 sqrt{4*2} + sqrt{2} + sqrt{64*2} =5 sqrt{2}$$-5*2 sqrt{2} + sqrt{2} +8 sqrt{2} =5 sqrt{2} -10 sqrt{2} + sqrt{2} +8 sqrt{2} =4 sqrt{2}$