50÷2.5+1.8×4.5简便运算50÷2.5+1.8×4.5怎样简便运算？

分类: 作业答案 • 2022-04-12 13:28:49

问题描述：

50÷2.5+1.8×4.5简便运算
50÷2.5+1.8×4.5怎样简便运算？

答

50÷2.5+1.8×4.5
=50×2÷（2.5×2)+1.8×4.5
=50×2÷5+1.8×4.5
=20+1.8×4.5
=20+0.9×2×4.5
=20+0.9×9
=20+8.1
=28.1

答

50÷2.5+1.8×4.5
=﹙50×4﹚÷﹙2.5×4﹚+0.9×2×4.5
=200÷10+0.9×9
=20+8.1
=28.1