1樓:新野旁觀者
計算,能簡算的要簡算。
15/7-(8/7+9/14)
=15/7-8/7-9/14
=1-9/14
=5/14
6/7+(4/5-3/10)
=6/7+1/2
=19/14
7/10-1/4+3/10-3/4
=(7/10+3/10)-(1/4+3/4)=1-1
=05/12+(6/7+7/12)
=(5/12+7/12)+6/7
=1+6/7
=1又6/7
7/8-1/6-5/12
=17/24-5/12
=7/24
13/12-5/6+11/24
=1/4+11/24
=17/24
2樓:巨集哥
15/7-(8/7+9/14)
=15/7-8/7-9/14
=1-9/14
=5/14
6/7+(4/5-3/10)
=6/7-1/2
=5/14
7/10-1/4+3/10-3/4
=(7/10+3/10)-(1/4+3/4)=1-1
=05/12+(6/7+7/12)
=5/12+7/12+6/7
=1+6/7
=1又6/7
7/8-1/6-5/12
=7/8-(1/6+5/12)
=7/8-7/12
=7/24
13/12-5/6+11/24=
=26/24-20/24+11/24
=17/24
能簡便計算的,要簡便計算: (5/8+7/15)+3/8 5/9-5/12+4/9
3樓:匿名使用者
(5/8+7/15)+3/8=(5/8+3/8)+7/15=1+7/15=1又7/15=22/7;
計算下面各題,能簡便計算的要簡便計算。 3/5+3/4-5/6 8/9+2/7+5/7 15/8-3/4-1/4 = = = = = =
4樓:吃葷的兔子
3/5+3/4-5/6 8/9+2/7+5/7 15/8-3/4-1/4
=36/60+45/60-50/60 =8/9+1 =15/8-1
=31/60 =17/9 =7/8
9/7-1/6+3/7 7/4-12/23-3/4 5-6(3/8+1/6)
= 12/7-1/6 = 1-12/23 =5-(9/4+1)
= 72/42-7/42 =11/23 =7/4
=65/42
計算。(能簡算的要簡算)3/4+5/12--11/24=、23/28+(13/14+2/7)=、9/16--1/8--3/8=、1/15+2/7+14/15+5/7=、
5樓:我影身
解答:列項相消法是小學中常常涉及對簡便運演算法則公式是 1/n(n+1) =1/n -1/(n+1) 例1/12=1/3 -1/4
∵3/4=1﹣1/4,5/12=1/2﹣1/12,11/24=1/2 ﹣1/24
∴3/4+5/12--11/24=1﹣1/4+﹙1/2﹣1/12﹚-﹙1/2 ﹣1/24﹚=17/24
下面幾題方法類似!這就不說了,你按照這方法去做下!
6樓:匿名使用者
27/32+1/8-9/16 =27/32+4/32-18/32 =13/32 7/9-(1/3+=3/4-3/4+1/3 =1/3 9/10-7/12-5/12 =9/10-(7/12+5/12) ,
計算下面各題,能簡算的要簡算1/2+4/7+3/7 1/10+3/8-2/5 1-(2/3+1/8) 7/8-(2/3-1/4) 1/9+(1/6+2/9)+5/6
7樓:新野旁觀者
計算下面各題,能簡算的要簡算
1/2+4/7+3/7
=1/2+(4/7+3/7)
=1/2+1
=1又1/2
1/10+3/8-2/5
=19/40-2/5
=3/40
1-(2/3+1/8)
=1-2/3-1/8
=1/3-1/8
=5/24
7/8-(2/3-1/4)
=7/8+1/4-2/3
=9/8-2/3
=11/24
1/9+(1/6+2/9)+5/6
=(1/9+2/9)+(1/6+5/6)
=1/3+1
=1又1/3
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