62.8*4.29+6.28*57.1 简便方法计算

来源：百度知道 编辑：UC知道 时间：2024/05/30 01:18:21
怎样才能用简便方法算啊!看起来也不简便啊!请各位老师赐教!拜谢

62.8*4.29+6.28*57.1
=6.28*10*4.29+6.28*57.1
=6.28*42.9+6.28*57.1
=6.28*(42.9+57.1)
=6.28*100
=628

62.8*4.29+6.28*57.1
=6.28*42.9+6.28*57.1
=6.28*（42.9+57.1）
=6.28*100
=628

慢了...

62.8×4.29+6.28×57.1
＝6.28×42.9+ 6.28×57.1
=6.28×(42.9+57.1)
=6.28×100
=628
一个因数扩大几倍，另一个因数缩小几倍，积不变。

62.8*4.29+6.28*5.71
=6.28*(4.29+5.71)
=6.28*10
=62.8

62.8*4.29+6.28*57.1
=6.28*42.9+6.28*57.1
=6.28(42.9+57.1)
=628

62.8*4.29+6.28*57.1
=6.28*(42.9+57.1)
=6.28*100
=628