1樓:匿名使用者
3.5*9.8
=3.5*(10-0.2)
=3.5*10-3.5*0.2
=35-0.7
=34.3
脫式計算:一、用簡便計算下面各題。3(6-3/4)×4/3 = = = =
2樓:巨集哥
(6-3/4)×4/3
=6×4/3-3/4×4/3
=8-1=7
3樓:匿名使用者
(6-3/4)x4/3=6x4/3-3/4x4/3=8-1=7
脫式計算題(能簡便的要用簡便方法計算)
4樓:匿名使用者
2.5×
0.32×125
=(2.5×0.4)×(0.8×125)
=1×100
=100
907×99+907
=907×(99+1)
=907×100
=90700
(1/3+1/4+1/5)×60
=(1/3)×60+(1/4)×60+(1/5)×60=20+15+12
=47[(1/7)-(1/9)]×63-(2/3)=(1/7)×63-(1/9)×63-(2/3)=9-7-(2/3)
=1又1/3
(3/5)×[(2/8)×2-(1/3)]=(3/5)×[(1/2)-(1/3)]
=(3/5)×(1/6)
=1/10
÷(4/5)
=×(5/4)
=(4/15)×(5/4)
=1/3
12.5×4×0.25×8
=(12.5×8)×(4×0.25)
=100×1
=100
(6/7)×125×7×8
=[(6/7)×7]×(125×8)
=6×1000
=6000
24×[(5/8)+(5/6)]-35
= 24×(5/8)+24×(5/6)-35=15+20-35
=35-35
=0(分數我用括號括起來了,寫的時候記得去掉,5/8讀作八分之五,應該看得懂吧!)
有疑問,請追問
5樓:匿名使用者
3. 09x3. 9÷26
=12. 051÷26
=0. 4635
6樓:匿名使用者
10^5x0.001=100 907x100=90700 20+15+12=47
下面的實在看不清
7樓:匿名使用者
1、(2.5*0.4)*(8*125)=1*1000=10002、907x99+907=907*(99+1)=907003、1/3*60+1/4*60+1/5*60=20+15+12=474、1/7*63-1/9*63-2/3=9-7-2/3=4/35、沒看出來怎麼簡便,只有按順序來=3/5*(1/2-1/3)=1/10
6、還是沒看出來怎麼簡便,只有按順序來=1-(1/5+1/3)/(4/5)=1-2/3=1/3
7、(12.5*8)*(4*0.25)=100*1=1008、【(6/7)*7】*(125*8)=6*1000=10009、【24*(1/8+1/6)】*5-35=(3+4)*5-35=0
脫式計算:一、用簡便方法計算下面各題。1.6/5×2/15×2/15×4/5 = = = =
8樓:樂為人師
6/5×2/15+2/15×4/5
=(6/5+4/5)×2/15
=2×2/15
=4/15
脫式計算下面各題(能簡算的要用簡便方法計算,並寫出簡算過程). (84×27-2166)÷17 115×3.
9樓:小柒
1(84×27-2166)÷17,
=(2268-2166)÷17,
=102÷17,
=6;211
5×3.7+5.3÷5
11+2.2,
=2.2×3.7+5.3×2.2+2.2,=2.2×(3.7+5.3+1),
=2.2×10,
=22;
3(0.75÷3-0.1)×(1-23),=(0.25-0.1)×13,
=0.15×13,
=0.05.
脫式計算:一、用簡便計算下面各題。67/18-7/18 ×4/5 = = = =
10樓:匿名使用者
7/18-7/18x4/5
=7/18x(1-4/5)
=7/18x1/5
=7/90
11樓:匿名使用者
原式=7/18x(1-4/5)
=7/18x1/5
=7/90
12樓:匿名使用者
7/18-7/18×4/5
=7/18×(1-4/5)
=7/18×1/5
=7/90
計算下面各題,能用簡便方法的要用簡便方法計算. (1)9.78×2.3+2.3×10.22 (2)1.5×11-7.8
13樓:小希
(1)9.78×
2.3+2.3×10.22,
=(9.78+10.22)×2.3,
=20×2.3,
=46;
(2)1.5×11-7.83+3.5,
=16.5-7.83+3.5,
=8.67+3.5,
=12.17;
(3)7.25÷(31-29.55)×1.3,=7.25÷1.45×1.3,
=5×1.3,
=6.5;
(4)75.6÷[0.7×(8.5-7.6)],=75.6÷[0.7×0.9],
=75.6÷0.63,
=120.
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