А)6sin30°-2cos45°+sin780°=3-√2+sin(720°+60°)=3-√2+sin60°=3-√2+√3/2=
б) 3sin(-π/6)+cos(-π)+sin²(π/2)=-3/2-1+1=-1,5
- 7/12; 2,132; -0,6; 2,123; 2,(13)<span>
</span>-0,6 и - 7/12
-6/10 и -7/12
-3/5 и -7/12
-36/60 < -35/60
2,132; 2,123; 2,(13)
2,132 и 2,123 и 2,(13)
2,132 и 2,123 и 2,1313
2,123 < 2,(13) < 2,132
Итог:
-36/60 < -35/60 < 2,123 < 2,(13) < 2,132
-0,6 < - 7/12 < 2,123 < 2,(13) < 2,132
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