3.14×2.34+6.28×3.84怎么简便计算3.14×2.34+6.28×3.84=3.14x2.34+3.14x2x3.84=3.14x（2.34+7.768）=3.14x10.02=3.14x10+3.14x0.02=31.4+0.0628=31.4628
