1樓:
應該不難,不過寫的看不懂是什麼意思~幾道題都分不清
脫式計算,能簡便的要簡便。 23/25除以(3/4+2/5) 1/7x9/13除以5/14除
2樓:瑩星
23/25÷
(3/4+2/5)
=23/25÷23/20
=23/25×20/23
=4/5
1/7×9/13÷5/14÷3/13
=1/7×9/13×14/5×13/3
=6/5
=1又1/5
15/16÷(5/12÷5/8+3/8)
=15/16÷(2/3+3/8)
=15/16÷25/24
=9/10
(2/3-1/2+1/6)÷1/24
=(2/3-1/2+1/6)×24
=16-12+4=8
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
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