1樓:匿名使用者
1題:原式=1/3-1/4+1/4-1/5+1/5-···+1/98-1/99
=1/3-1/99
=32/99
2題:原式=1.2*30*1.09+1.2×67.3=1.2×(67.3+32.7)
=1.2*100
=120
3題:原式=1.8*40*2.09-1.8*73.6=1.8*(83.6-73.6)
=1.8*10
=184題:原式=4*1.7*8*2.1*19.3*8*4*0.1=4*8*(1.7*2.1+19.3*0.1)=32*5
=160
5題:原式=1.2*40*1.08+1.2×56.8=1.2*(43.2+56.8)
=1.2*100
=120
6題:原式=0.9999×0.
7+0.1111*9*0.3=0.
9999*0.7+0.9999*0.
3=0.9999*(0.7+0.
3)=0.9999
解釋:1題.經過嘗試可發現:1/(3*4)=1/3-1/4,之後所有的都以此類推就ok了。
2到6:思路都一樣,找到一個最小公約數,之後把這個數提出來,括號裡面多半是10、100這樣的數,ok了。
2樓:匿名使用者
(1) __1___ __ 1 _____ ……___1___3×4 4×5 98×99
1/(3*4)=(1/3)-(1/4)
1/(4*5)=(1/4)-(1/5)
………………
1/(98*99)=(1/98)-(1/99)原式=1/3-1/4+1/4-1/5+1/5-1/6+……+1/98-1/99
=1/3-1/99
=32/99
(2) 36×1.09+1.2×67.3
=1.2*20*1.09+1.2*67.3=1.2*(21.8+67.3)
=1.2*89.1
=106.92
(3) 72×2.09-1.8×73.6
=1.8*40*2.09-1.8*73.6=1.8*(83.6-73.6)
=180
6.8×16.8+19.3×3.2
=(10-3.2)*16.8+19.3*3.2=168-16.8*3.2+19.3*3.2=168+(19.3-16.8)*3.2
=168+2.5*3.2
=168+8=176
48×1.08+1.2×56.8
=1.2*40*1.08+1.2*56.8=1.2*(43.2+56.8)
=120
0.9999×0.7+0.
1111×2.7=(1.111-0.
1111)*0.7+0.1111*2.
7=7.777-0.1111*(2.
7-0.7)=7.777-0.
2222
=7.5548
3樓:青青的柳葉
1題:原式=1/3-1/4+1/4-1/5+1/5-···+1/98-1/99
=1/3-1/99
=32/99
2題:原式=1.2*30*1.09+1.2×67.3=1.2×(67.3+32.7)
=1.2*100
=120
3題:原式=1.8*40*2.09-1.8*73.6=1.8*(83.6-73.6)
=1.8*10
=184題:原式=4*1.7*8*2.1*19.3*8*4*0.1=4*8*(1.7*2.1+19.3*0.1)=32*5
=160
5題:原式=1.2*40*1.08+1.2×56.8=1.2*(43.2+56.8)
=1.2*100
=120
6題:原式=0.9999×0.
7+0.1111*9*0.3=0.
9999*0.7+0.9999*0.
3=0.9999*(0.7+0.
3)=0.9999
小學五年級簡便計算題
4樓:娉婷嫻媛
簡便運算
3.2×
2.5×0.125
74.9÷ 0.25÷ 4
2.5×0.37× 0.04
3.68×7.8+2.2×3.68
3.8×0.6+62×0.06 4.7×9.9+0.4724.98—(1.36+1.98)
4.69×10.1
3.2×2.5×0.125
74.9÷ 0.25÷ 4
2.5×0.37× 0.04
3.68×7.8+2.2×3.68
3.8×0.6+62×0.06 4.7×9.9+0.4724.98—(1.36+1.98)
4.69×10.1
祝你學習進步,天天開心,採納吧!
5樓:亓韞卜樂蕊
1.(25×4)+(25×6)
2.5×7×10×6
=25×(4+6)
=(5×6)×(7×10)
=25×10
=30×70
=250
=210
6樓:卷展祝水丹
懶蛋!你要答案,我偏不給你了!
7樓:戎曼凡申從
再給你一點,網上多的是五年級數學簡便計算練習卷下面各題怎樣算簡便就怎樣算。
6.9+4.8+3.1
0.456+6.22+3.78
15.89+(6.75-5.89)
4.02+5.4+0.98
5.17-1.8-3.2
13.75-(3.75+6.48)
3.68+7.56-2.68
7.85+2.34-0.85+4.66
35.6-1.8-15.6-7.2
3.82+2.9+0.18+9.1
9.6+4.8-3.6
7.14-0.53-2.47
5.27+2.86-0.66+1.63
13.35-4.68+2.65
73.8-1.64-13.8-5.36
47.8-7.45+8.8
0.398+0.36+3.64
15.75+3.59-0.59+14.2566.86-8.66-1.34
0.25×16.2×4
(1.25-0.125)×8
3.6×102
3.72×3.5+6.28×3.5
36.8-3.9-6.1
15.6×13.1-15.6-15.6×2.14.8×7.8+78×0.52
32+4.9-0.9
4.8×100.1
56.5×9.9+56.5
7.09×10.8-0.8×7.09
25.48-(9.4-0.52)
4.2÷3.5
320÷1.25÷8
18.76×9.9+18.76
3.52÷2.5÷0.4
3.9-4.1+6.1-5.9
5.6÷3.5
9.6÷0.8÷0.4
4.2×99+4.2
17.8÷(1.78×4)
0.49÷1.4
1.25×2.5×32
3.65×10.1
15.2÷0.25÷4
0.89×100.1
146.5-(23+46.5)
3.83×4.56+3.83×5.44
4.36×12.5×8
9.7×99+9.7
27.5×3.7-7.5×3.7
8.54÷2.5÷0.4
0.65×101
3.2×0.25×12.5
(45.9-32.7)÷8÷0.125
3.14×0.68+31.4×0.032
5.6÷1.25÷0.8÷2.5÷0.4
7.2×0.2+2.4×1.4
8.9×1.01
7.74×(2.8-1.3)+1.5×2.263.9×2.7+3.9×7.3
18-1.8÷0.125÷0.8
12.7×9.9+1.27
21×(9.3-3.7)-5.6
15.02-6.8-1.02
5.4×11-5.4
2.3×16+2.3×23+2.3
9.43-(6.28-1.57)
3.65×4.7-36.5×0.37
46×57+23×86
13.7×0.25-3.7÷4
2.22×9.9+6.66×6.7
101×0.87-0.91×87
10.7×16.1-15.1×10.7
0.79×199
4.8+8.63+5.2+0.37
5.93+0.19+2.81
1.76+0.195+3.24
2.35+1.713+0.287+7.651.57+0.245+7.43
6.02+3.6+1.98
0.134+2.66+0.866
1.27+3.9+0.73+16.1
7.5+4.9-6.5
3.07-0.38-1.62
1.29+3.7+2.71+6.3
8-2.45-1.55
3.25+1.79-0.59+1.75
23.4-0.8-13.4-7.2
0.32×403
3.2+0.36+4.8+1.64
1.23+3.4-0.23+6.6
0.25×36
12.7-(3.7+0.84)
36.54-1.76-4.54
0.25×0.73×4
7.6×0.8+0.2×7.6
0.85×199
0.25×8.5×4
1.28×8.6+0.72×8.6
12.5×0.96×0.8
10.4-9.6×0.35
0.8×(4.3×1.25)
3.12+3.12×99
28.6×101-28.6
0.86×15.7-0.86×14.7
2.4×102
2.31×1.2×0.5
14-7.32-2.68
2.64+8.67+7.36+11.33
70÷28
(2.5-0.25)×0.4
9.16×1.5-0.5×9.16
3.6-3.6×0.5
63.4÷2.5÷0.4
4.9÷1.4
3.9÷(1.3×5)
(7.7+1.54)÷0.7
2.5×2.4
2.7÷45
15÷(0.15×0.4)
0.35×1.25×2×0.8
32.4×0.9+0.1×32.4
15÷0.25
4.5÷1.8
4.2÷3.5
930÷0.6÷5
8樓:潛翮淳于雅容
ppt#256,1,分數四則-乘除法-計算題
1、直接寫出得數。
0.45×2.5=
0.8×1.25=
0.3×3.6=
0.3×0.3=
10×0.07=
0.3×1.4=
0.05×7=
0.92×0.4=
0.2×0.26=
0.14×4=
0.02×0.1=
1.2×0.3=0.2×0.4=
8.2+1.8=
100-35.22=
2.3×4=
2.5×0.4=
2.4×5=
0.22×4=
3.25×0=
0.9-0.52=
3.99×1=
0×3.52=
12.5×8=
8÷10
=10-1.8-7.2=
0.43+3.57=
2.5×4×12=
0.9×0.8=
7.5x-3x
=a+3a+7a==
1.05×100=
1÷0.5=
0.96÷3=
1.47÷0.7=
5.4÷6=
0.16.5×10=
0.56×100=
3.78×100=
4÷0.8
=3.215×100=
0.8×10=
4.08×100=
1.1×0.2
=0.6×0.8
=3×0.9=
2.5×0.4=
3.6×0.4=
12.5×8=
50×0.04=
80×0.3
=1.1×9=
0.16×5
=1.78+2.2
=9.6÷0.6
=1.2×0.5-0.4
=0.7÷0.01
=2.5×0.4
=12-3.9=
1.25×8÷1.25
=6.6÷0.66
=5.37×0+4.63
=3.9+2.03=
4.2÷3.5=
1.6+2.4×0.3
=2.14-0.9=
27+456+73=
0.3×0.3=
7.2+2.8=
0.9÷0.01=
12÷0.3=
2.87÷0.7=
13÷4=
0.96÷0.3=
1.5×0.4=
7÷0.25=
2.5×0.7×0.8=
8-2.5=
16÷1.6=
5.6×1.01=
8×(2.5+0.25)=
0.36+0.64=
64.32÷16=
4.2÷0.1=
72.8÷0.8=
8.4÷4.2=
13.8+9.9=
2.4×2.5=
0.05×0.8=
2.56-0.37=
1.25×0.8×0.5=
12×2.5=
1.23×3=
3.2÷1.6=
3.5+3.5×3=
19.6÷2=
8.8÷2.2=
0.75×4=
(1.5+0.25)×4=
0.5×0.8=
8.4×0.2=
1.6×0.2=
7.2×0.3=
2.8×0.3=
0.9÷0.15=
1.8×0.4=
5.5÷0.55=
0.08×100=
2.2÷0.11=
5.46+4.54=
12.5×0.8=
0.35×0.3=
1.4×5=
2.8×4=
19.6÷4=
22.5×4=
2、用豎式計算
0.396÷1.2=
0.756÷0.36=
15.6×13=
0.18×15=
0.025×14=
3.06×36=
0.04×0.12=
3.84×2.6≈
5.76×3=
(保留一位小數)
7.15×22
90.75÷3.3
3.68×0.25
16.9÷0.13
1.55÷3.9
3.7×0.016
13.76×0.8=
5.2×0.6
8.4×1.3
6.4×0.5
4.48×0.4
5.25×5
35.4×4.2
0.042×0.54
0.76×0.32
0.25×0.046
2.52×3.4
1.08×25
0.12×0.5×0.16=
4.8×0.25=
0.125×1.4≈
(保留兩位小數)
2.5÷0.7=
(保留三位小數)
10.1÷3.3=
(商用迴圈小數)
10.75÷12.5=
(用乘法驗算)
3.25×9.04=
(用除法驗算)
3、脫式計算(能簡算的要簡算)
2.5×7.1×4
16.12×99+16.12
5.2×0.9+0.9
7.28×99+7.28
4.3×50×0.2
64-2.64×0.5
26×15.7+15.7×24
(2.275
+0.625)×0.28
3.94+34.3×0.2
1.2×(9.6÷2.4)÷4.8
8.9×1.1×4.7
2.7×5.4×3.9
3.6×9.85-5.46
8.05×3.4+7.6
6.58×4.5×0.9
2.8×0.5+1.58
32+4.9-0.9
4.8-4.8×0.5
(1.25-0.125)×8
4.8×100.1
56.5×99+56.5
7.09×10.8-0.8×7.09
4.85
+0.35
÷1.4
8.7×
17.4
-8.7
×7.4
12.5×0.4×2.5×8
0.87×3.16+4.64
9.5×101
0.68
÷(5.2
-3.5)×
1.25
40.5
÷0.81
×0.18
4.8×(15
÷2.4)
2.13.×0.×8257
6.81+6.81×99
0.25×185×40
4.4×0.8-3.4×0.8
(9.37+9.37+9.37+9.37)×2.54.2.×1.+1.×1.75
2.37×6.3+2.37×3.7
2.5×1.25×0.32
3.8×10.1
2.5×(3.8×0.04)
7.69×101
3.8×10.1
0.25×39+0.25
0.125×72
46×0.33+54×0.33
(8×5.27)
×1.25
6.81+6.81×99
0.25×185×40
6.8×0.75÷0.5
3.75÷0.125–2.75
1.53+23.4÷7.2
9.5×99
13.5×0.98
12.5×8.8
二、解方程:
54-x=24
7x=49
126÷x=42
13+a=28.5
2.4x=26.4
7.5x-3x=18
5×1.3-2x=5.5
24x+6x=63.6
5.6x+4.4x=5.2
三、列式計算
1、20減去0.8的差除以4個0.3的和,商是多少?
2、一個數的2.6倍加上9,和是35,求這個數。(用方程解)3、1.2與4的積,減去6.除以5的商,
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