Question

简便运算20道五年级

Answer 1

(1).(65/7+65/9)÷(5/7+5/9)
=65×（1/7+1/9）÷[5×（1/7+1/9）]
＝65×（1/7+1/9）÷5÷（1/7+1/9）
＝65÷5
＝13
(3).4/1 * 7/3 + 0.25 * 7/4 - 4/1
=4/1*（7/3+7/4-1）
=4/1*0
=0
(4).36又4/3 * 6
=36*6+4/3*6
=216+2/9
=300友2/1
(5).2002 * 2001/2000
=（2001+1）*2001/2000
=2001*2001/2000+1*2001/2000
=2000+2001/2000
=2000又2001/2000
(6).6/1 * （25*12）*5/4
=6/1*25*12*5/4
=（6/1*12）*（5/4*25）
=2*20
=40
(7).10分之9乘99+10分之7
=(7/10+2/10)*99+7/10
=99/5+99*7/10+7/10
=99/5+7/10(99+1)
=99/5+70
=89.8
(8).1/3除以（2/3-2/5*3/5）
=1/3除以32/75
=1/3*75/32
=25/32
(9).81.5*15.8+81.5*51.8+67.6*18.5
=81.5(15.8+51.8)+67.6*18.5
=81.5*67.6+67.6*18.5
=67.6(81.5+18.5)
=67.6*100
=6760
(10).（9/20+6/7+15/16）/（3/20+2/7+5/16）
=3(3/20+2/7+5/16)/(3/20+2/7+5/16)
=3
(11).1993*1994-1/1993+1992*1994
=1994(1993+1992)-1/1993
=7946090-1/1993
=15836557369/1993
(12).25×1.25×32
=25*1.25*4*8
=(25*4)*(1.25*8)
=100*10
=1000
(13).45×9.9
=45*(10-0.1)
=45*10-45*0.1
=45-4.5
=40.5
(14).4.2×102-8.4
=4.2*102-4.2*2
=4.2*(102-2)
=4.2*100
=420
(15).7.86-(5.63-0.86)-1.37
=7.86-5.63+0.86-1.37
=(7.86+0.86)-(5.63+1.37)
=8.72-7
=1.72
(16).3.6-2.8+7.4-7.2
=(3.6+7.4)-(2.8+7.2)
=11-10
=1
(17).8/17÷23+1/23×9/17+1/23
=8/17*1/23+1/23*9/17+1/23
=1/23*(8/17+9/17+1)
=1/23*2
=2/23
(18).(1/2+1/3)÷3/5-17/18
=5/6*5/3-17/18
=25/18-7/18
=18/18
=1
(19).1497+436=(1497+3)+433=1500+433=1933
(20).101*7.8=(100+1)*7.8=100*7.8+1*7.8=780+7.8=787.8

追问

19道

追答

补一道
125*3+125*5+25*3+25
=25*(5*3+5*5+3+1)
=25*44
=25*40+25*4
=1100

追问

五年级分数

*这是什么

追答

乘号的意思，电脑上用这个*代替“×”

追问

分数

追答

里面有分数运算的，还差几道直接说，以后提问的时候请直接说明是分数的简便运算，方便他人方便自己

追问

10道