1)√121 – 10*√6.4*√0.1 = )√121 – 10*√64/100=11-10*8/10=11-8=3
2)2*√5 – √45 + √80 =2*√5 – √9*5 + √16*5=2√5 – 3√5 + 4√15=3√5
3) x-2y=0
x=2y
y=x/2
1)√121 – 10*√6.4*√0.1 = )√121 – 10*√64/100=11-10*8/10=11-8=3
2)2*√5 – √45 + √80 =2*√5 – √9*5 + √16*5=2√5 – 3√5 + 4√15=3√5
3) x-2y=0
x=2y
y=x/2