小学五年级分数计算3/4+5/6-(1/2-1/4)和4/15-(4/15-1/7)
来源:百度知道 编辑:UC知道 时间:2024/07/03 04:11:22
3/4+5/6-(1/2-1/4)
=1-1/4+5/6-1/2+1/4
=1+2/6
=1又1/3
4/15-(4/15-1/7)
=4/15-4/15+1/7
=1/7
3 5 1 1 4 4 1
—+ — -( — - —) — - ( — - —)
4 6 2 4 15 15 7
18 20 1 4 13
=—+ — - — = —- —
24 24 4 15 105
38 6 98 13
=—- — = — - —
24 24 105 105
4 17
=— = —
3 21
3/4+5/6-(1/2-1/4)
=1-1/4+5/6-1/2+1/4
=1+2/6
=1又1/3
4/15-(4/15-1/7) 3 5 1 1 4 4 1
—+ — -( — - —) — - ( — - —)
4 6 2 4 15 15 7
18 20 1 4 13
=—+ — - — = —- —
24 24 4 15 105
38 6 98 13
=—- — = — - —
24 24 105 105
4 17
=— = —
3 21
=4/15-4/15