小学五年级200道简便计算
发布网友
发布时间:2022-04-23 13:11
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共4个回答
热心网友
时间:2023-10-11 02:11
简算:
125÷25=(125×4)÷(25×4)
7000÷125=(7000×8)÷(125×8)
6400÷800=(6400÷100)÷(800÷100)
78×99=78×100-78×1
58×95+42×95=(58+42)×95
(125+23)×8=125×8+23×8
含义
“4.9+0.1-4.9+0.1”这是小学数学第八册练习二十七第二题中的一道非常简单的常见简便运算题。当我给学生布置了这道题后,我以为学生会毫不犹豫地使用加法交换率和结合率,顺利完成此题,但是当我批改学生的作业时,却发现了以下三种情况:
①4.9+0.1-4.9+0.1=(4.9-4.9)+(0.1+0.1)
②4.9+0.1-4.9+0.1=4.9-4.9+0.1+0.1
③4.9+0.1-4.9+0.1=(4.9+0.1)-(4.9+0.1)
热心网友
时间:2023-10-11 02:12
3.29+0.73+2.27 3.29-0.73-2.27 7.5+2.5-7.5+2.5
7.325-3.29-3.325 7.325-(5.325+1.7) 7.325-(5.325-1.7)
3.29+0.73-2.29+2.27 3.29×0.25×4 0.125×8.8
0.25×0.28 0.125×3.2×2.5 35×40.2
0.25×4÷0.25×4 3.5×9.9 3.5×99+3.5
3.5×101-3.5 3.5×9.9+3.5×0.1 3.5×2.7+35×0.73
3.5×2.7-3.5×0.7 (32+5.6)÷0.8 3.5÷0.6-0.5÷0.6
4.9÷3.5 7÷0.25÷4 7÷0.125
7.35÷(7.35×0.25) 7.35÷(7.35÷0.25)
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
(4.23+6.17)×0.8 0.86×15.7-0.86×14.7 2.4×102
14-7.32-2.68 2.64+8.67+7.36+11.33 2.31×1.2×0.5
(2.5-0.25)×0.4 9.16×1.5-0.5×9.16 3.6-3.6×0.5
4.5÷1.8 4.2÷3.5 930÷0.6÷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
0.35×1.25×2×0.8 32.4×0.9+0.1×32.4 15÷0.25
70÷28 15÷(0.15×0.4) 4.25÷2.5×9.9+0.17
3.29+0.73+2.27 3.29-0.73-2.27 7.5+2.5-7.5+2.5
7.325-3.29-3.325 7.325-(5.325+1.7) 7.325-(5.325-1.7)
3.29+0.73-2.29+2.27 3.29×0.25×4 0.125×8.8
0.25×0.28 0.125×3.2×2.5 35×40.2
0.25×4÷0.25×4 3.5×9.9 3.5×99+3.5
3.5×101-3.5 3.5×9.9+3.5×0.1 3.5×2.7+35×0.73
3.5×2.7-3.5×0.7 (32+5.6)÷0.8 3.5÷0.6-0.5÷0.6
4.9÷3.5 7÷0.25÷4 7÷0.125
7.35÷(7.35×0.25) 7.35÷(7.35÷0.25)
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
(4.23+6.17)×0.8 0.86×15.7-0.86×14.7 2.4×102
14-7.32-2.68 2.64+8.67+7.36+11.33 2.31×1.2×0.5
(2.5-0.25)×0.4 9.16×1.5-0.5×9.16 3.6-3.6×0.5
4.5÷1.8 4.2÷3.5 930÷0.6÷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
0.35×1.25×2×0.8 32.4×0.9+0.1×32.4 15÷0.25
70÷28 15÷(0.15×0.4) 4.25÷2.5×9.9+0.17
6.9+4.8+3.1
15.89+(6.75-5.89)
7.85+2.34-0.85+4.66
35.6-1.8-15.6-7.2
13.75-(3.75+6.48)
47.8-7.45+2.55
66.86-8.66-1.34
0.25×16.2×4
0. 25×32 ×0.125
2 .5 ×(4 +0.4)
(1.25-0.125)×8
4.8×100.1
4.2×99
56.5×9.9+56.5
5.4×11-5.4
3.83×4.56+3.83×5.44
7.09×10.8-0.8×7.09
3.65×4.7-36.5×0.37
13.7×0.25-3.7÷4
10.7×16.1-1.1×10.7 +10.7 ×5
4.9÷1.4
3.9÷(1.3×5)
63.4÷2.5÷0.4
(7.7+1.4)÷0.7
18 ÷ (2+9)
1. 0.18 +4.26 -0.18 +4.26 ☆
2. 0.58 ×1.3 ÷ 0.58 ×1.3 ☆
3. 7.3 ÷4 + 2.7 × 0.25 ☆
4. 3.75 × 0.5 - 2.75 ÷ 2 ☆
5. 5.26 × 0.125 + 2.74 ÷ 8 ☆
a ÷ b ÷ c = a ÷ (b × c)
6. 6.3 ÷ 1.8
7. 4.2 ÷ 3.5
8. 9.5 ÷(1.9 × 8)
9. 12.8 ÷ (0.4 × 1.6)
10. 930 ÷ 0.6 ÷5
11. 63.4 ÷ 2.5 ÷ 0.4
12. (7.7 + 1.54)÷ 0.7 ☆
13. (11.7 + 9.9)÷ 0.9 ☆
1. 0.45 × 201
2. 0.58 × 10.1
3. 50.2 × 99
4. 4.7 × 9.9
5. 3.28 × 5.7 + 6.72 × 5.7
6. 2.1 × 99 + 2.1
7. 1.7 × 9.9 + 0.17
8. 23 × 0.1 + 2.3 × 9.9
热心网友
时间:2023-10-11 02:12
26-14)×8 50×(2+80)
(10×12)-63 (27-23)×12
(38-16)×24 (24+38)×6
(87-42)×15 (84-15×3)
16×(49-28) 45×(84-48] )
(58+37)×6 (64-9)×5
95×(64-45) (19-14)×9
5×(6+42) (81-70)×6
(9+31)×11 (85+14)×7
(14+20)×26 (28+16)×8
(52-82)×18 (12-36)×41
(58+37)×8 (64-9)×5
(68-68)×55 32×(15+25)
(6-1)×65 65×(48-12×4)
42×(74+6) (6+9)×2.5
(71-56)×92 6×(37-29)
12×(6+8) (12-7)×6
12×(6+7 ) 68×(19+32)
(58+37)×2 (64-45)×4
(88-64)×21 (16+64)×65
10×(4-5 ) 38×(50-10)
(18+22)×8 (37+21)×38
(50-24)×9 (18+25)+2
(37+44)×11 (42+22 ) ×8
(28+22) ×35 (37+10) ×96
(21+78) ×10 6-(25+75)
(22+68) ×28 (90-73)×10
4.58-(2.58+1.5) 2.3÷0.25÷0.4
5.6÷3.5 2.7×0.99
0.125×3.2×0.25 3.72×9.9+3.72×0.1
0.99×0.81+0.99×0.19+0.99
1.39×25-0.039×250
(4.16+4.16+4.16+4.16)×2.5
(2.5-0.25)×0.4 3.78×99+3.78
65÷(0.65×4) 4.9+0.1-4.9+0.1
5.52-(3.52-0.72) 2.6×0.5+7.4÷2
42.2×103 8.3×99
1.25×2×0.37×4 1.25×8-0.025×80
(2.31+6.69)÷0.03 35.2÷0.25÷0.4
3.6×10.1
热心网友
时间:2023-10-11 02:13
一、观察下面的算式,它们是根据什么定律或性质成立的:
第一组
125÷25=(125×4)÷(25×4)
7000÷125=(7000×8)÷(125×8)
6400÷800=(6400÷100)÷(800÷100)
第二组
78×99=78×100-78×1
58×95+42×95=(58+42)×95
(125+23)×8=125×8+23×8
第三组
4×29×25=29×(25×4)
64×125=8×(8×125)
32×125×25=(8×125)×(25×4)
二、知识的运用
1、铺垫练习:
在□里填上合适的数;
⑴2000÷125=(2000×□)÷(125×8)
⑵1500÷250=150÷□=□÷2500=(1500×□)÷(250×4)
⑶167×10=167×3+167×□=167×14-167×□
⑷64×25=16×(□×25)=8×(□×25)
2、连线:
38×10 (4600×4)÷(25×4)
24×125 38×(99+1)
75×101-75 38×100+38×1
4600÷25 75×(101-1)
58×99 3×(8×125)
38×99+38 58×100-58
2、比较练习:
286×201
286×199
286×199+286
286×201-286
3、简便计算下面各题:
125×93×8
8×(500+125)
47×163+37×47
4000÷125
4、发展题:
650÷25+26×99
17×101+83
17×99-83