1) √18 - √32 + √72 = √2*9 - √16*2 + √36*2 = 3√2 - 4√2 + 6√2 = 5 √2
2) √72 + √50 - √162 = √36*2 + √ 25*2 - √81*2 = 6√2 + 5√2 - 9√2 = 2√2
3) √200 - √8 - √50 = √100*2 - √4*2 - √25*2 = 10√2 - 2√2 - 5√2 = 3√2
4) √128 + √18 - √98 = √2*64 + √9*2 - √49*2 = 8√2 + 3√2 - 7√2 = 4√2
Г, А, Б, В