1樓:匿名使用者
你的分子分母寫
來反了吧,因為自分數線
/相當於除號,分數線/的右邊才是分母哦
(12/7+8/7)*36
=7/12*36 +7/8*36
=21+31.5
=52.5
25/8*6/5+6/1*25/8
=8/25x(5/6+1/6)
=8/25x1
=8/25
2/1-2/1*4/1
=1/2x(1-1/4)
=1/2x1/4
=1/8
137*136/7
=(136+1)x7/136
=136x7/136+1x7/136
=7+7/136
=7又7/136
5/2*11-5/2
=2/5x(11-1)
=2/5x10=4
用簡便方法計算下面各題.5/8*12*3/4,4/7*5/6*6,(1/5+3/4)*20,(5/6+2/9)*36,12*(3/4--1/2),
2樓:匿名使用者
11/12+5/8+3/8+1/12 5-3/7-4/7 2/5*20+3/5*20 5/6-1/40.25+2/5) =3.4-0.
4-0.25 =3-0.25 =2.
75 7/8-7/27-20/
簡便運算(-3/4-5/6+7/8)*(-24) (-3/5)*3/5+8/25*(-24) (2*3*4*5 )*(1/2+1/3+1/4+1/5)
3樓:我不是他舅
(-3/4-5/6+7/8)
*(-24)
=-3/4*(-24)-5/6*(-24)+7/8*(-24)=18+20-21
=17(-3/5)*3/5+8/25*(-24)=-9/25-8*24/25
=-3*3/25-64*3/25
=(-3-64)*3/25
=-67*3/25
=-201/25
=-8又1/25
(2*3*4*5 )*(1/2+1/3+1/4+1/5)=(2*3*4*5 )*1/2+(2*3*4*5 )*1/3+(2*3*4*5 )*1/4+(2*3*4*5 )*1/5
=3*4*5+2*4*5+2*3*5+2*3*4=60+40+30+24
=154
4樓:匿名使用者
簡便運算:
(-3/4-5/6+7/8)
*(-24)
=-3/4*(-24)-5/6*(-24)+7/8*(-24)=18+20-21
=17(-3/5)*3/5+8/25*(-24)=-9/25-8*24/25
=-3*3/25-64*3/25
=(-3-64)*3/25
=-67*3/25
=-201/25
(2*3*4*5 )*(1/2+1/3+1/4+1/5)=(2*3*4*5 )*1/2+(2*3*4*5 )*1/3+(2*3*4*5 )*1/4+(2*3*4*5 )*1/5
=3*4*5+2*4*5+2*3*5+2*3*4=60+40+30+24
=154
5樓:匿名使用者
(-3/4-5/6+7/8)
*(-24)
=-3/4*(-24)-5/6*(-24)+7/8*(-24)=18+20-21
=17(-3/5)*3/5+8/25*(-24)=-9/25-8*24/25
=-3*3/25-64*3/25
=(-3-64)*3/25
=-67*3/25
=-201/25
=-8又1/25
``````````````
(2*3*4*5 )*(1/2+1/3+1/4+1/5)=(2*3*4*5 )*1/2+(2*3*4*5 )*1/3+(2*3*4*5 )*1/4+(2*3*4*5 )*1/5
=3*4*5+2*4*5+2*3*5+2*3*4=60+40+30+24
=154
wsdfghf
6樓:
(-3/4-5/6+7/8)*(-24)=(1/8-5/6)*(-24)=-3+20=17
(-3/5)*3/5+8/25*(-24)=1/25*(-9-8*24)=-201/25
(2*3*4*5 )*(1/2+1/3+1/4+1/5)=3*4*5+2*4*5+2*3*5+2*3*4=60+40+30+24=154
(1/15+1/21)×105 45÷5/7÷7/8 8/13÷7-1/7×6/13 1/5×5/8-1/5÷8/3 3/5÷5/8+2/5÷5/8簡便運算
7樓:叫啥知不道
(1/15+1/21)×105
=(1/15)
*(15*7)+(1/21)*(21*5)=7+5
=1245÷5/7÷7/8
=5*9*(7/5)*(8/7)
=9*8
=728/13÷7-1/7×6/13
=8/13*(1/7)-6/13*(1/7)=(8/13-6/13)*(1/7)
=2/13*1/7
=2/91
1/5×5/8-1/5÷8/3
=1/5*5/8-1/5*3/8
=1/5*(5/8-3/8)
=1/5*1/4
=1/20
3/5÷5/8+2/5÷5/8
=(3/5+2/5)*(8/5)
=1*8/5
=8/5
x-1/2x=5/8
1/2x=5/8
x=5/8*2
x=5/4
4/5x÷2=7/16
4/5x=7/16*2
x=7/8*5/4
x=35/32
1/4x+1/3x=5/18
7/12x=5/18
x=5/18*12/7
x=10/21
1/8x÷3/10=5/18
1/8x=5/18*3/10
x=1/12*8
x=2/3
4/5x-3/4x=25
(16/20-15/20)*x=25
x=25/(1/20)
x=500
8樓:匿名使用者
(1/15+1/21)×105=7+5=12
45÷5/7÷7/8 =45*7/5*8/7 =45*8/5=72
8/13÷7-1/7×6/13 =(8-6)/(13*7)=2/91
1/5×5/8-1/5÷8/3=5/40-3/40=2/40=1/20
3/5÷5/8+2/5÷5/8=(3/5+2/5)÷5/8 =8/5
x-1/2x=5/8 , x=5/4
4/5x÷2=7/16 , 2/5 x= 7/16, x=35/32
1/4x+1/3x=5/18 , 7/12 x = 5/18, x=10/21
1/8x÷3/10=5/18 , 1/8 x =5/18*3/10, x=2/3
4/5x-3/4x=25, (16-15)/20 x =25, x=500
計算題 0.8*25%*1.25*40% (3/4+1/6-5/12)÷1/12 5/7*7/24+1/5/4/5 4*【3/5-(3/4-2/5)】*1/10
9樓:快樂又快樂
0.8*25%*1.25*40%=(4/5)*(1/4)*(5/4)*(2/5)=2/5。
內(3/4+1/6--5/12)除容以1/12=(3/4+1/6--5/12)x12=9+2--5=6。
5/7*7/24+1/5/4/5=5/24+1/4=5/24+6/24=11/24。
4*【3/5--(3/4--2/5)】*1/10=4*(3/5--3/4+2/5)*1/10=4*(1--3/4)*1/10=4*(1/4)*1/10=1/10
24*(1/4+2/3--1/6)=6+16--4=18。
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