1. (1.3×3.9×11.7+3×9×27+1/17×3/17×9/17)/(1.3×2.6×3.9+3×6×9+1/17×2/17×3/17)
2. 2/3+2/9+2/27+2/81+2/243
3. 1+2+3+4+5+6+7+8+9+8+7+6+5+4+3+2+1/999999999²
4. 2×3×4×5+5×6×7×8/2×3×4×5
5. (1+1/2+1/3+1/4)×(1/2+1/3+1/4+1/5)-(1+1/2+1/2+1/4+1/5)×(1/2+1/3+1/4)
我的意思是帮我做一下问题补充里的题!!!