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+2/2433.1+2+3+4+5+6+7+8+9+8+7+6+5+4+3+2+1/999999999²4.2×3×4×5+5×6×7×8/2×3×4×55.(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)

问题描述:

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)