Răspuns:
Ana x=√2+√3 y=√2-√3
x-y=√2+√3-(√2-√3)=
√2+√3-√2+√3=2√3∉Q
Maria x=3√2 y= -√18=-√9*2=-3√2
x+y=3√2-3√2=0∈Q
Ioana x= √2+1/√8=√2+1/√4*2=√2+1/2√2
y=√2
xy=(√2+1/2√2)·√2=√2²+1/2=2+1/2=5/2∈Q
Sabina
x=2√6 y=5√3
x:y=2√6:5√3=2√2·3:5√3=0,4√2∉Q
AAu obtinut numere rationale Maria si Ioana
Explicație pas cu pas:
