1樓:妙酒
(3/2+75%)÷(2—2/1)
=(1.5+0.75)÷(2-0.5)
=2.25÷1.5
=1.5
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脫式計算:5/8÷75%- 2/19×38% (3/8+37.5%)÷(2.1-209%) 2.5×125×32
2樓:古德納克
5/8÷75%- 2/19×38%
=5/8×100/75-2/19×38/100=5/6-1/25
=119/150
(3/8+37.5%)÷(2.1-209%)=(0.375+0.375)÷(2.1-2.09)=0.75÷0.1
=0.75×10
=7.5
2.5×125×32
=2.5×32×125
=2.5×4×4×2×5×25
=10×10×100
=10000
小學五年級500到脫式計算題
3樓:阿維
1、0.125×96
解析:此題先利用減法分配律把96轉換成(100-4),再利用乘法結合律,使得運算簡便。
0.125×96
=0.125×(100-4)
=0.125×100-0.125×4
=12.5-0.25
=122、33333x44444+66666x77778
解析:33333x44444可以變換為66666×22222,提取公約66666,變換為66666×(22222+77778)再用乘法分配律來脫式計算。
33333x44444+66666x77778
=33333×2×22222+66666×77778
=66666×22222+66666×77778
=66666×(22222+77778)
=66666×100000
=6666600000
3、30-(3.8+0.75)
解析:此題主要利用加法結合律和分配律,先把3.8變換成(4-0.
2),0.75變換成(1-0.25),再利用加法交換律,先算整數,再算小數,最後利用加法結合律,去掉括號運算。
30-(3.8+0.75)
=30-[(4-0.2)+(1-0.25)]
=30-[(4+1)-(0.2+0.25)]
=30-(5-0.45)
=30-5+0.45
=25.45
4、3.6×2.5
解析:此題先利用乘法分配律把3.6轉化成9×0.4,再利用乘法交換律湊整使得運算簡便。
3.6×2.5
=9×0.4×2.5
=1×9
=95、555×15+111×25
解析:此題先把555變換成111×5,再利用運用乘法分配律和提取公約數來脫式計算。
555×15+111×25
=111×5×15+111×25
=111×(5×15)+111×25
=111×75+111×25
=111×(75+25)
=111×100
=11100
6、98×8/99
解析:此題先利用減法分配律把98轉換成(99-1),再利用乘法結合律使得運算簡便。
98×8/99
=(99-1)×8/99
=99×8/99-1×8/99
=8-8/99
=7又91/99
7、0.9+9.9+99.9+999.9+9999.9
解析:此題先找規律,5個數都差0.1可湊整,先利用湊整法變換一下,再利用加法結合律(a+b)+c=a+(b+c),來進行脫式計算。
0.9+9.9+99.9+999.9+9999.9
=(1-0.1)+(10-0.1)+(100-0.1)+(1000-0.1)+(10000-0.1)
=1+10+100+1000+10000-0.1×5
=11111-0.5
=11110.5
4樓:雨下的櫻花
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
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
(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)
5樓:凌月霜丶
0.35×1.6+0.35×3.4
6.72-3.28-1.72
0.45+6.37+4.55
5.4+6.9×3-(
25-2.5)2×41846-620-3804.8×46+4.8×54
0.8+0.8×2.5
1.25×3.6×8×2.5-12.5×2.428×12.5-12.5×20
23.65-(3.07+3.65)
(4+0.4×0.25)8×7×1.25
1.65×99+1.65
27.85-(7.85+3.4)
48×1.25+50×1.25×0.2×87.8×9.9+0.78
(1010+309+4+681+6)×123×9146×782×6×854
5.15×7/8+6.1-0.60625
39.(284+16)×(512-8208÷18)40.120-36×4÷18+35
41.(58+37)÷(64-9×5)
42.(6.8-6.
8×0.55)÷8.543.
0.12× 4.8÷0.
12×4.844.(3.
2×1.5+2.5)÷1.
6 (2)3.2×(1.5+2.
5)÷1.6
45.6-1.6÷4= 5.
38+7.85-5.37=46.
7.2÷0.8-1.
2×5= 6-1.19×3-0.43=47.
6.5×(4.8-1.
2×4)= 0.68×1.9+0.
32×1.9
48.10.15-10.
75×0.4-5.749.
5.8×(3.87-0.
13)+4.2×3.7450.
32.52-(6+9.728÷3.
2)×2.551.[(7.
1-5.6)×0.9-1.
15] ÷2.552.5.
4÷[2.6×(3.7-2.
9)+0.62]53.12×6÷(12-7.
2)-6 (4)12×6÷7.2-6
6樓:新野旁觀者
6/7+2/15+1/7+13/15
19/21+5/7-3/14
2/3+5/9-2/3+5/9
8/9+(1/4-1/9)+3/4
0.58+5/13+1.12+8/13
11-4/11-7/11
22+55÷11-2/8
1/7+33.5+6/7-3.5
7.09-5/12+12.03-7/12
14/15-(6/15 +1/3)
13/5-0.81 -0.19
7/8+1/8 -5/9 -4/9
5 -(0.5 -3/10 )
7.68 - 7.68×0.5
5.2+4.8×3.5
7.8×6.9+2.2×6.9
5.6×0.25 8×(20-1.25)
127+352+73+44
25+71+75+29 +88 (
243+89+111+57
9405-2940÷28×21
920-1680÷40÷7 690+47×52-398148+3328÷64-75 360×24÷32+7302100-94+48×54 51+(2304-2042)×234215+(4361-716)÷81 (247+18)×27÷2536-720÷(360÷18) 1080÷(63-54)×80(528+912)×5-6178 8528÷41×38-904264+318-8280÷69 (174+209)×26- 9000814-(278+322)÷15 1406+735×9÷453168-7828÷38+504 796-5040÷(630÷7)285+(3000-372)÷36
(-54)x1/6x(-1/3)
18.1+(3-0.299÷0.23)×1 2(6.8-6.8×0.55)÷8.5
0.12× 4.8÷0.12×4.8
(3.2×1.5+2.5)÷1.6
3.2×(1.5+2.5)÷1.6 5.6-1.6÷4=38+7.85-5.37=
7.2÷0.8-1.2×5= 6-1.19×3-0.43=6.5×(4.8-1.2×4)=
0.68×1.9+0.32×1.9
10.15-10.75×0.4-5.7
5.8×(3.87-0.
13)+4.2×3.7432.
52-(6+9.728÷3.2)×2.
5[(7.1-5.6)×0.
9-1.15] ÷2.55.
4÷[2.6×(3.7-2.
9)+0.62]12×6÷(12-7.2)-6
12×6÷7.2-6
33.02-(148.4-90.85)÷2.57×(5/21+9/714)
脫式計算,能簡算的要簡算.①(35+13)÷75+14②29+5.28+79+4.72③85.7×16+14.3×16④2+48%÷
7樓:流星
①(35+13
)÷75+14
,=14
15÷75+1
4,=23
+14,=1112;
②29+5.28+7
9+4.72,
=(29+79
)+(5.28+4.72),
=1+10,
=11;
③85.7×
內16+14.3×16,
=(85.7+14.3)×容16,
=100×16,
=1600;
④2+48%÷0.6-34,
=2+0.8-34,
=2.8-0.75,
=2.05.
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