这三道题要用简便运算
3个回答
2016-10-09 · 知道合伙人教育行家
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0.4x99+2/5
=0.4x99+0.4
=0.4x(99+1)
=0.4x100
=40
=0.4x99+0.4
=0.4x(99+1)
=0.4x100
=40
追答
1/8x76+1.25x1.4
=0.125x76+0.125x14
=0.125x(76+14)
=0.125x(100-10)
=0.125x100-0.125x10
=12.5-1.25
=11.25
1/8x76
=1/8x(72+4)
=1/8x72+1/8x4
=9+1/2
=9又1/2
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展开全部
0.4x99+2/5
=0.4x99+0.4
=0.4x(99+1)
=0.4x100
=40
=0.4x99+0.4
=0.4x(99+1)
=0.4x100
=40
已赞过
已踩过<
评论
收起
你对这个回答的评价是?
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