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五年级下册数学分数简便运算题

我这里好多! 望采纳!

看在我都看不懂你问的什么的份上,,给个采纳吧。。谢谢。。

复习分数简便计算 一、指导方法 分数的简便运算与整数、小数的方法是一样的,整数的简便运算定律和性质在分数和小数中同样适用。在分数的相关计算中,要想到凑整。 二、基本运算定律 1、 加法交换律:a+b=b+a 加法结合律:(a+b)+c=a+(b+c) 2、 ...

加减法简便计算题 : 5/8+1/2+3/8 7/9-2/9+4/9 6/7-3/7+4/7 5/6+2/3-1/2 7/8-2/7+1/8 3/5-1/2+2/5 8/9+1/8-1 3/7+4/7-1 6/7+4/7+2/7-5/7

4/7+1/14-1/2 =8/14+1/14-7/14 =2/14 =1/7 5/3-3/8-5/8 =5/3-(3/8+5/8) =5/3-1 =2/3 3/5+3/11+7/5+11 =(3/5+7/5)+11+3/11 =2+11+2/11 =13又2/11 3/4-{5/6-1/3} =3/4-(5/6-2/6) =3/4-1/2 =3/4-2/4 =1/4

2/3-7/8+1/3 =(2/3+1/3)-7/8 =1-7/8 =1/8 5/6-(3/7-1/6) =(5/6+1/6)-3/7 =1-3/7 =4/7 1-1/3-2/3 =1-(1/3+2/3) =1-1 =0 1+3/5-1/10 =1+6/10-1/10 =1+1/2 =1又1/2 3/8-12/13+5/8 =3/8+5/8-12/13 =1-12/13 =1/13 1-(1/2-3/4) =1+3/4-2/4 =1+1/4 =5/...

例1、5.76+13.67+4.24+6.33 =(5.76+4.24)+(13.67+6.33) =10+10 =20 例2、37.24+23.79-17.24 =37.24-17.24+23.79 =20+23.79 =43.79 例3、 4×3.78×0.25 =4×0.25×3.78 =1×3.78 =3.78 例4、 125×246×0.8 =125×0.8×246 =100×246 =24600...

2/1*2=1 3/1*3=1 3/2*3=2 3/1*6=2 4/3*8=6 5/3*20=12 7/3*14=6 8/7*40=35 4/3*16=12 9/5*27=15 2/1*30=15 12/7*24=14 30/1*30=1 51/9*102=18 19/9*76=36 4/9*8=18 5/8*90=144 99/98*99=98 3/14*6=28 7/1*28=4 10/1*90=9 5/3*105=63 19/7*38=14 5...

1. 5/2 -( 3/2 + 4/5 ) 2. 7/8 + ( 1/8 + 1/9 ) 3. 5/6 + ( 1/2 + 2/3 ) 4. 9/7 - ( 2/7 - 10/21 ) 5. 3/7 + 49/9 + 4/7 6. 8/9 + 15/36 + 3/27 7. 5/2 - ( 3/2 + 4/5 ) 8. 7/8 + ( 1/8 + 1/9 ) 9. 9/7 - ( 2/7 - 10/21 ) 10. 1/5...

3/4+1/5=4/5 3/4-1/5=11/20 5/6+2/9=19/18 5/6-2/9=11/18 2/3+3/5=19/15 2/3-3/5=1/15 6/7+1/2=19/14 6/7-1/2= 5/14 2/3+1/6=5/6 1/3+1/4=7/12 1/3-1/4=1/12 1/5+1/7=12/35 1/5-1/7=2/35 1/4+1/9=13/36 1/4-1/9=5/36 1/8+1/9=17/72 1/8-1/9=1/72...

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