计算:3.14-6.28+9.42-12.56+15.7-18.84+47.1.

问题描述:

计算:3.14-6.28+9.42-12.56+15.7-18.84+47.1.

3.14-6.28+9.42-12.56+15.7-18.84+47.1,
=3.14-3.14×2+3.14×3-3.14×4+3.14×5-3.14×6+3.14×15,
=3.14×(1-2+3-4+5-6+15),
=3.14×12,
=37.68.