3.14²+68.6×1.314
=3.14²+68.6×(1+0.314)
=3.14²+68.6×1+68.6×0.314
=68.6+3.14²+6.86×3.14
=68.6+3.14×(3.14+6.86)
=68.6+3.14×10
=68.6+31.4
=100