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
要快,提前谢谢了,好的我可要加分的奥。

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