小学数学题(答得好有追加分得!)12/13-(1/2+2/13)简便计算计算:6/7+1/6-17/429/10-(7/8-1/2)3/5+5/9+1/611/18-(3/1+5/24)2/3+3/5+1/101-1/3-2/570分钟=( )小时计算下列各题后,你有什么发现?1/2+1/3 1/3-1/4 1/2-1/5
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![小学数学题(答得好有追加分得!)12/13-(1/2+2/13)简便计算计算:6/7+1/6-17/429/10-(7/8-1/2)3/5+5/9+1/611/18-(3/1+5/24)2/3+3/5+1/101-1/3-2/570分钟=( )小时计算下列各题后,你有什么发现?1/2+1/3 1/3-1/4 1/2-1/5](/uploads/image/z/2113660-28-0.jpg?t=%E5%B0%8F%E5%AD%A6%E6%95%B0%E5%AD%A6%E9%A2%98%28%E7%AD%94%E5%BE%97%E5%A5%BD%E6%9C%89%E8%BF%BD%E5%8A%A0%E5%88%86%E5%BE%97%21%EF%BC%8912%2F13-%EF%BC%881%2F2%2B2%2F13%29%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%97%E8%AE%A1%E7%AE%97%EF%BC%9A6%2F7%2B1%2F6-17%2F429%2F10-%287%2F8-1%2F2%293%2F5%2B5%2F9%2B1%2F611%2F18-%283%2F1%2B5%2F24%292%2F3%2B3%2F5%2B1%2F101-1%2F3-2%2F570%E5%88%86%E9%92%9F%3D%28+++%29%E5%B0%8F%E6%97%B6%E8%AE%A1%E7%AE%97%E4%B8%8B%E5%88%97%E5%90%84%E9%A2%98%E5%90%8E%2C%E4%BD%A0%E6%9C%89%E4%BB%80%E4%B9%88%E5%8F%91%E7%8E%B0%3F1%2F2%2B1%2F3+++1%2F3-1%2F4++++1%2F2-1%2F5)
小学数学题(答得好有追加分得!)12/13-(1/2+2/13)简便计算计算:6/7+1/6-17/429/10-(7/8-1/2)3/5+5/9+1/611/18-(3/1+5/24)2/3+3/5+1/101-1/3-2/570分钟=( )小时计算下列各题后,你有什么发现?1/2+1/3 1/3-1/4 1/2-1/5
小学数学题(答得好有追加分得!)
12/13-(1/2+2/13)简便计算
计算:
6/7+1/6-17/42
9/10-(7/8-1/2)
3/5+5/9+1/6
11/18-(3/1+5/24)
2/3+3/5+1/10
1-1/3-2/5
70分钟=( )小时
计算下列各题后,你有什么发现?
1/2+1/3 1/3-1/4 1/2-1/5 1/3+1/7
发现( ).
小学数学题(答得好有追加分得!)12/13-(1/2+2/13)简便计算计算:6/7+1/6-17/429/10-(7/8-1/2)3/5+5/9+1/611/18-(3/1+5/24)2/3+3/5+1/101-1/3-2/570分钟=( )小时计算下列各题后,你有什么发现?1/2+1/3 1/3-1/4 1/2-1/5
12/13-(1/2+2/13)
=12/13-2/13-1/2
=10/13-1/2
=20/26-13/26
=7/26
计算:
6/7+1/6-17/42
=36/42+7/42-17/42
=26/42
=13/21
9/10-(7/8-1/2)
=36/40-35/40+20/40
=21/40
3/5+5/9+1/6
=54/90+50/90+15/90
=123/90
=1又33/90
=1又11/30
11/18-(3/1+5/24)
=44/72-3-15/72
=29/72-216/72
=-187/72
=-2又43/72
2/3+3/5+1/10
=20/30+18/30+3/30
=41/30
=1又11/30
1-1/3-2/5
=15/15-5/15-6/15
=4/15
70分钟=(1又1/6)小时
计算下列各题后,你有什么发现?
1/2+1/3=5/6
1/3-1/4=1/12
1/2-1/5=3/10
1/3+1/7==10/21
发现(加法的规律:新分母=两个老分母相乘,新分子=两个老分母相加.减法规律:新分母=两个老分母相乘,新分子=较大的分母-较小的分母 ).
12/13-(1/2+2/13)
=12/13-1/2-12/13
=12/13-12/13-1/2
=-1/2
计算:
6/7+1/6-17/42
=36/42+7/42-17/42
=43/42-17/42
=26/42
9/10-(7/8-1/2)
=9/10-(7/8-4/8)
=9/10...
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12/13-(1/2+2/13)
=12/13-1/2-12/13
=12/13-12/13-1/2
=-1/2
计算:
6/7+1/6-17/42
=36/42+7/42-17/42
=43/42-17/42
=26/42
9/10-(7/8-1/2)
=9/10-(7/8-4/8)
=9/10-3/8
=36/40-15/40
=21/40
3/5+5/9+1/6
=27/45+25/45+9/45
=61/45
11/18-(3/1+5/24)
=11/18-77/24
=44/72-231/72
=187/72
2/3+3/5+1/10
=20/30+18/30+3/30
=41/30
1-1/3-2/5
=2/3-2/5
=9/15- 6/15
=1/5
70分钟=(1.17)小时
计算下列各题后,你有什么发现??
1/2+1/3 1/3-1/4 1/2-1/5 1/3+1/7
发现(分子为1的分数相加,分母相乘,分子相加;分子为1的分数相减,分母相乘,分子相减;).
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