<span>78 = 2 · 3 · 13;</span><span>117 = 3 · 3 · 13;</span><span>195 = 3 · 5 · 13;</span>НОД (78<span>; </span>117<span>; </span>195<span>) = </span>3 · 13<span> = </span><span>39;
</span><span>110 = 2 · 5 · 11;</span><span>154 = 2 · 7 · 11;</span><span>286 = 2 · 11 · 13;</span>НОД (110<span>; </span>154<span>; </span>286<span>) = </span>2 · 11<span> = </span><span>22;
</span><span>90 = 2 · 3 · 3 · 5;</span><span>126 = 2 · 3 · 3 · 7;</span><span>162 = 2 · 3 · 3 · 3 · 3.</span>НОД (90<span>; </span>126<span>; </span>162<span>) = </span>2 · 3 · 3<span> = </span><span>18</span>
Арабские....................
4. 20-2=20
20×20×20=8000
5. 30+5=35
175/35=5 часов
6. 9×9=81 или 9 в квадрате
7. 28×104=2912
2912/16=182
5059-988=4071
4071/23=177
182+177=359
8. 60+60×2+80×2=340