12.5×67+53×3.1+72×3.1 与125*1.2*1.5*1.8*35怎样计算简便?

来源:学生作业帮助网 编辑:六六作业网 时间:2024/12/25 01:03:19
12.5×67+53×3.1+72×3.1与125*1.2*1.5*1.8*35怎样计算简便?12.5×67+53×3.1+72×3.1与125*1.2*1.5*1.8*35怎样计算简便?12.5×6

12.5×67+53×3.1+72×3.1 与125*1.2*1.5*1.8*35怎样计算简便?
12.5×67+53×3.1+72×3.1 与125*1.2*1.5*1.8*35怎样计算简便?

12.5×67+53×3.1+72×3.1 与125*1.2*1.5*1.8*35怎样计算简便?
12.5×67+53×3.1+72×3.1
=12.5×67+(53+72)×3.1
=12.5×67+125×3.1
=12.5×67+12.5×31
=12.5×(67+31)

=12.5×98
=12.5×(100-2)
=1250-25
=1225


125×1.2×1.5×1.8×35
=(125×1.2)×(1.5×1.8)×35
=150×2.7×35
=405×35
=(400+5)×35
=14000+175
=14175

第一个先算后边两个,提取公因数,后边的全拆开125就是5的三次方