(+25/4)+(+1/2)+(-6.25)+(+1/3)+(-7/9)+(-5/6)
(+25/4)+(+1/2)+(-6.25)+(+1/3)+(-7/9)+(-5/6)
(+25/4)+(+1/2)+(-6.25)+(+1/3)+(-7/9)+(-5/6)
解:原式=[(+25/4)+(-6.25)]+[(+1/3)+(+1/2)+(-5/6)])+(-7/9)
=0+0+(-7/9)
=-7/9
【+6又1/4】+【+1/2】+【-6.25】+【+1/3】+【-7/9】+【-5/6】=
【+6又1/4】+【+1/2】+【-6.25】+【+1/3】+【-7/9】+【-5/6】 =25/4+1/2-25/4+1/3-7/9-5/6 =-7/9
5/18×9÷5/18×27 7/9÷6/5+2/9÷6/5 【1-(1/3+1/9)】÷25/36
为了表达清楚,我增加了括号:
(5/18)×9÷(5/18)×27
=(5/18)×9×(18/5)×27
=9×27
=243
(7/9)÷(6/5)+(2/9)÷(6/5)
=(7/9)×(5/6)+(2/9)×(5/6)
=[(7/9)+(2/9)]×(5/6)
=1×(5/6)
=5/6
{1-[(1/3)+(1/9)}÷(25/36)
={1-(4/9)}×(36/25)
=(5/9)×(36/25)
=4/5
拖式:4/5*(-25/3)*(-7/10)= (7/12-5/6+1)*(-24)= [1/5+(-1/2)+(-5/12)]*(+60)= -99又17/18*9=
4/5*(-25/3)*(-7/10)=(-20/3)×(-7/10)=12/3
(7/12-5/6+1)*(-24)=(19/12-10/12)×(-24)=9/12×(-24)=-18
[1/5+(-1/2)+(-5/12)]*(+60)=12-30-25=12-55=-43
-99又17/18*9=(-99-17/18)×9=-99×(10-1)-17/2=-990+9-17/2
=-881-8又1/2=-889又1/2
将1/2 1/3 1/6 1/9 2/9 4/9 5/9 5/18 7/8
先通分再按
492
357
816
的顺序添
492
357
816 是经典9宫数可以记一下
2/9-7/16*2/9 2/5*4*3/4 1/2*1/15+1/3*1/2 4/5*7/9*5/8 5/6*5/9+5/9*1/6 5/7*16*5/21 怎么做
2/9-7/16*2/9
=2/9*(1-7/16)
=2/9*9/16
=1/8
2/5*4*3/4
=2/5*(4*3/4)
=2/5*3
=6/5
1/2*1/15+1/3*1/2
=1/2*(1/15+1/3)
=1/2*2/5
=1/5
4/5*7/9*5/8
=4/5*5/8*7/9
=1/2*7/9
=7/18
5/6*5/9+5/9*1/6
=(5/6+1/6)*5/9
=1*5/9
=5/9
5/7*16*5/21
=80/7*5/21
=400/147
有理数:25/|[7/2-(-9/4)-1/3-1/4-(+1/6)]*(-5)=
25/|[7/2-(-9/4)-1/3-1/4-(+1/6)]*(-5)
=25/(7/2+9/4-1/3-1/4-1/6)*(-5)
=25/[7/2-(1/3+1/6)+(9/4-1/4)]*(-5)
=25/(7/2-1/2+2)*(-5)
=25/5*(-5)
=25/(-25)
=-1
【(7/8)*4(1/2)+(1/6)】/【13(1/3)-3(1/3)/(5/16)/2(7/8)】
发放给搞不搞
7/9*5/6/14/27 1/2*2/5+9/10/9/20 5/8*1/4/5/8*1/4 (1/2+2/3+3/4)*36
你好:
7/9*5/6/14/27
=7/9×5/6×27/14
=5/4
=1又1/4
1/2*2/5+9/10/9/20
=1/5+2
=2又1/5
5/8*1/4/5/8*1/4
=1/4×1/4
=1/16
(1/2+2/3+3/4)*36
=1/2×36+2/3×36+3/4×36
=18+24+27
=69
3-(5/7+6/7*1/3)*2/3 (5/8-1/4)*(8/9+1/3) 1.75*6/7+3/14*7/4+3/4 5/6*5/9+5/9*1/6+2/3
3-(5/7+6/7*1/3)*2/3=3-(5/7+2/7)*2/3=3-1*2/3=3-2/3=7/3(三分之七或者二又三分之二)
(5/8-1/4)*(8/9+1/3)=(5/8-2/8)*(8/9+3/9)=3/8*11/9=11/24 1.75*6/7+3/14*7/4+3/4=7/4*6/7+3/14*7/4+3/4=3/2+3/8+3/4=12/8+3/8+6/8=21/8(八分之二十一或者二又八分之五)
5/6*5/9+5/9*1/6+2/3=(5/6+1/6)*5/9+2/3=1*5/9+2/3=5/9+6/9=11/9九分之十一或者一又九分之二)
你几年级啊,这种题还是自己做的好,基本没有难度,个人认为看懂的难度大于做题的难度