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x=(3-4√6+8)+4√6
x=3-4√6+8+4√6
x=3+8
x=11
x=(√3 - 2√2)² +4√6
x=(3-2*√3*2√2+(2√2)²)+4√6
x=3-4√6+8+4√6
x=11
11∈N
co należało dowieść
x=(√3-2√2)2 +4√6
x=(3-8) +4√6
x=-5 + 4*2,4
x=-5+9,6
x=4,6