大师作文网都要简便方法计算,第一个采纳.分数的简便运算.
来源：学生作业帮 编辑：大师作文网作业帮 分类：数学作业 时间：2024/11/16 06:16:18
都要简便方法计算,第一个采纳.分数的简便运算.
3/19-7/15+7/15
=3/19+(7/15-7/15)
=3/19+0
=3/19
1/6+(5/9+5/6)
=(1/6+5/6)+5/9
=1+5/9
=1又5/9
7-5/11-6/11
=7-(5/11+6/11)
=7-1
=6
3/4-3/8+1/4
=(3/4+1/4)-3/8
=1-3/8
=7/8
5/6-4/9+1/6-2/9
=(5/6+1/6)-(4/9+2/9)
=1-2/3
=1/3
5/8+1/8-3/10-1/10
=(5/8+1/8)-(3/10+1/10)
=3/4-2/5
=7/20
9/10-(1/10+2/5)
=9/10-1/10-2/5
=4/5-2/5
=2/5
=3/19+(7/15-7/15)
=3/19+0
=3/19
1/6+(5/9+5/6)
=(1/6+5/6)+5/9
=1+5/9
=1又5/9
7-5/11-6/11
=7-(5/11+6/11)
=7-1
=6
3/4-3/8+1/4
=(3/4+1/4)-3/8
=1-3/8
=7/8
5/6-4/9+1/6-2/9
=(5/6+1/6)-(4/9+2/9)
=1-2/3
=1/3
5/8+1/8-3/10-1/10
=(5/8+1/8)-(3/10+1/10)
=3/4-2/5
=7/20
9/10-(1/10+2/5)
=9/10-1/10-2/5
=4/5-2/5
=2/5