(125+9)x8 这道题怎么用简便运算做?
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(125+9)x8 这道题怎么用简便运算做?
![(125+9)x8 这道题怎么用简便运算做?](/uploads/image/z/4819544-8-4.jpg?t=%EF%BC%88125%2B9%EF%BC%89x8+%E8%BF%99%E9%81%93%E9%A2%98%E6%80%8E%E4%B9%88%E7%94%A8%E7%AE%80%E4%BE%BF%E8%BF%90%E7%AE%97%E5%81%9A%3F)
(125+9)x8
=(125+10-1)x8
=125x8+10x8-8
=1000+80-8
=1072
再问: 那81+9x91呢?
再答: 81+9x91 =81+(10-1)x91 =81+910-91 =910-10 =900
=(125+10-1)x8
=125x8+10x8-8
=1000+80-8
=1072
再问: 那81+9x91呢?
再答: 81+9x91 =81+(10-1)x91 =81+910-91 =910-10 =900