Răspuns :
(|2^45-3^30|-9^15):4^20=[-2^45+3^30-3^(2*15)]:2^(2*20)=-2^45:2^40=-1*2^5=-32; asta la prima
b)[tex](2 \sqrt{2} +1)^2+(2- \sqrt{2} )^2- \sqrt{10 \sqrt{2} -15}^2 [/tex]
= [tex]=8+4 \sqrt{2}+1+4-4 \sqrt{2} -|10 \sqrt{2} -15|=13+2+10 \sqrt{2}-15=10 \sqrt{2} [/tex]
b)[tex](2 \sqrt{2} +1)^2+(2- \sqrt{2} )^2- \sqrt{10 \sqrt{2} -15}^2 [/tex]
= [tex]=8+4 \sqrt{2}+1+4-4 \sqrt{2} -|10 \sqrt{2} -15|=13+2+10 \sqrt{2}-15=10 \sqrt{2} [/tex]