1樓:大王鍋莊
5/8÷5/7+2/5×1/4 =5/8×7/5+1/10=7/8+1/10=45/40=9/8
(1/3+1/3)×2/7-1/8=2/3×2/7-1/8=4/21-1/8=32/168-21/168=11/168
能簡便的就簡便計算 5/7+5/6+2/7+1/6= 1/15*(1/3+1/12) 1/4/(3-5/13-8/13) 4/9/【5/6-(1/6+1/3)】
2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。
3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
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)
4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
5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
6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
7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
能簡便計算的要用簡便計算4/7+1/14-1/2 5/3-3/8-5/8 3/5+3/11+7/5+11 3/4-{5/6-1/3} 10
8樓:匿名使用者
4/7+1/14-1/2
=4/7-1/2 +1/14
=8/14-7/14+1/14
=(8-7+1)/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 3/4-{5/6-1/3}=3/5+7/5+3/11+11
=2+11+3/11
=13+3/11
=13又311
3/4-{5/6-1/3}
=3/4-5/6+1/3
=9/12-10/12+4/12
=(9-10+4)/12
=3/12
=1/4
怎麼樣簡便就怎麼簡便 5/6x1/7+1/6除7 8-(5/8除5/24+2/11) 7/11除[2/5-(1-7/10)] 25/12-4/9-5/9-1/12
9樓:妙酒
5/6x1/7+1/6除7
=5/6x1/7+1/6x1/7
=(5/6+1/6)x1/7
=1x1/7
=1/7
8-(5/8除5/24+2/11)
=8-3+2/11
=5+2/11
=5又2/11
7/11除[2/5-(1-7/10)]
=0.7÷(0.4-1+0.7)
=0.7÷0.1
=725/12-4/9-5/9-1/12
=(25/12-1/12)-(4/9+5/9)=2-1=1
10樓:
5/6*1/7+1/6 /7
=5/6*1/7+1/6*1/7
=(5/6+1/6)*1/7
=1*1/7
=1/7
8-(5/8 / 5/24+2/11)
=8-[(5/5)/(8/24)+2/11]=8-(1/(1/3)+2/11)
=8-3-2/11
=5-2/11
=55/11-2/11
=53/11
7/11除[2/5-(1-7/10)]
7/11 / [2/5-1+7/10]
=7/11 / [4/10-10/10+7/10]=7/11/ [(4-10+7)/10]
=7/11/(1/10)
=7*10/11
=70/11
25/12-4/9-5/9-1/12
=(25/12-1/12)-(4/9+5/9)=24/12-9/9
=2-1=1
11樓:桃海頂級
4444445ybh
計算下列各題,能用簡便演算法的就用簡便演算法。 6/7+3/4*12/7 5/3*7/8-7/8*2/3 2/3*45*1/10
12樓:匿名使用者
6/7+3/4*12/7
=6/7(1+3/4 *2)=6/7(1+3/2)=6/7*5/2=15/7
5/3*7/8-7/8*2/3=7/8(5/3-2/3)=7/82/3*45*1/10=2/3*9*5*1/10=3*2*5*1/10=3
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