1.165+312-284=______;
2.1999+498-2008=______;
3.10.16×15-21.5×4.6=______;
4.12.5×45-36×101+86.5×45=______;
5.(56÷60+0.5) ×(1-9/2÷43/3)=______;
6.(2.5+1/3÷1/2)÷(75%×2/3+1/6)=______;
7.(7×1-3×1)+(7×3-3×2)+ (7×5-3×3)+……+(7×49-3×25)=______;
8.131×17+51×123=______;
…………
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