1樓:匿名使用者
5/7+5/6+2/7+1/6=(5/7+2/7)+(5/6+1/6)=1+1=2
1/15*(1/3+1/12)=1/15(4/12+1/12)=1/15*5/12=1/36
1/4/(3-5/13-8/13)=1/4/(3-1)=1/4/2=1/8
4/9/【5/6-(1/6+1/3)】=4/9/(5/6-1/6-1/3)=4/9/(4/6-1/3)=4/9/(1/3)=4/3
其實你應當自己做,不會就應努力學,不學永遠不會。
2樓:surfer男孩
5/7+5/6+2/7+1/6= 5/7+2/7+5/6+1/6=1+1=2
1/15*(1/3+1/12) =1/15*(4/12+1/12)=1/15*5/12=1/36
1/4/(3-5/13-8/13)=1/4/[3-(5/13+8+13)]=1/4/[3-1]=1/8
4/9/【5/6-(1/6+1/3)】=4/9[5/6-1/6-1/3]=4/9/1/3=4/3
下面各題怎樣簡便就怎樣算 (1)5/7+5/6+2/7+1/6 (2)1/15乘以(1/3+1/1
3樓:匿名使用者
(1)5/7+5/6+2/7+1/6
=5/7+2/7+5/6+1/6=2
(2)1/15x(1/3+1/12)=1/15x5/12=1/36(3)1/3+3除以1/2
(4)3.7乘以6/5+1.3除以5/6
(5)1/4除以3-5/13-8/13)
(6)0.5乘以(3/5+6/25)
4樓:
(1)原
式=(5/7+2/7)+(5/6+1/6)=1+1=2;
(2)原式=1/15*5/12=1/36;
(3)原式=1/3+3*2=19/3;
(4)原式=37/10*6/5+13/10*6/5=(37/10+13/10)*6/5=5*6/5=6;
(5)原式=1/12-5/13-8/13=1/12-(5/13+8/13)=1/12-1=-11/12;
(6)原式=1/2*(15/25+6/25)=1/2*21/25=21/50。
3/7+1/2-3/7簡便計算5/7-1/6+5/14簡便計算7/12-(5/6-5/12)簡便計算2/3-1/2-1/18 5
5樓:淨壇使者
3/7 + 1/2 - 3/7
= 3/7 - 3/7 + 1/2
= 1/2
5/7 - 1/6 + 5/14
= 10/14 + 5/14 - 1/6
= 1 + 1/14 - 1 + 5/6
= 3/42 + 35/42
= 38/42
= 19/21
7/12 - ( 5/6 - 5/12 )= 7/12 - 5/6 + 5/12
= 1 - 5/6
= 1/6
2/3 - 1/2 - 1/18
= 12/18 - 9/18 - 1/18= 2/18
= 1/9
2x - 1/8 = 7/8
2x = 7/8 + 1/8
2x = 1
x = 1/2
x - 1/9 - 8/9 = 2
x - 1 = 2
x = 2 + 1
x = 3
6樓:匿名使用者
真是閒的蛋疼,這題就是寫出來消磨時間的!
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 = = = = = =
7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
下面各題怎樣簡便怎樣 算 (1)7/5+6/5+7/2+6/1 (2)15/1(3/1+12/
8樓:匿名使用者
=13/5+7/2+6
=12又1/10
(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
9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
10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
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