脱式计算大全及答案 脱式计算大全及答案带过程
\u8131\u5f0f\u8ba1\u7b97\u989850\u9053\u5e26\u7b54\u6848\u548c\u8fc7\u7a0b1\u3001 1.25\u00d7(8+10)=1.25\u00d78+1.25\u00d710=10+12.5=22.5
2\u30011.24+0.78+8.76=(1.24+8.76)+0.78=10+0.78=10.78
3\u30011/2-(4/5-1/2)=1/2+1/2-4/5=1-4/5=1/5
4\u30014800\u00f725\u00f74=4800\u00f7(25x4)=4800\u00f7100=4800\u00f7100=48
5\u30012/5-(3/8-3/5)=2/5+3/5-3/8=1-3/8=5/8
6\u30013/4-(3/7-1/4)=3/4+1/4-3/7=1-3/7=4/7
7\u30013.2x0.125x2.5=0.125x8x(0.4x2.5)=1x1=1
8\u30010.4\u00d7125\u00d725\u00d70.8=(0.4\u00d725)\u00d7(125\u00d70.8)=10\u00d7100=1000
9\u30011.25\u00d7(8+10)=1.25\u00d78+1.25\u00d710=10+12.5=22.5
10\u30019123-(123+8.8)=9123-123-8.8=9000-8.8=8991.2
11\u30011.24\u00d78.3+8.3\u00d71.76=8.3\u00d7(1.24+1.76)=8.3\u00d73=24.9
12\u30019999\u00d71001=9999\u00d7(1000+1)=9999\u00d71000+9999\u00d71=10008999
13\u300114.8\u00d76.3-6.3\u00d76.5+8.3\u00d73.7=(14.8- 6.5)\u00d76.3+8.3\u00d73.7=8.3\u00d76.3+8.3\u00d73.7=8.3\u00d7(6.3+3.7)=8.3\u00d710=83
14\u30011.24+0.78+8.76=(1.24+8.76)+0.78=10+0.78=10.78
15\u3001933-157-43=933-(157+43)=933-200=733
16\u30014821-998=4821-1000+2=3823
17\u300132\u00d7125\u00d725=4\u00d78\u00d7125\u00d725=(4\u00d725)\u00d7(8\u00d7125)=100\u00d71000=100000
18\u30011.8+18\u00f71.5-0.5\u00d70.3=1.8+12-0.15=13.8-0.15=13.65
19\u30016.5\u00d78+3.5\u00d78-47=52+28-47=80-47
20\u30013.7x2.56-2.3=9.472-2.3=7.172
21\u30011.24+0.78+8.76=(1.24+8.76)+0.78=10+0.78=10.78
22\u30011/2-(4/5-1/2)=1/2+1/2-4/5=1-4/5=1/5
23\u30014800\u00f725\u00f74=4800\u00f7(25x4)=4800\u00f7100=4800\u00f7100=48
24\u30012/5-(3/8-3/5)=2/5+3/5-3/8=1-3/8=5/8
25\u30013/4-(3/7-1/4)=3/4+1/4-3/7=1-3/7=4/7
26\u30013.2x0.125x2.5=0.125x8x(0.4x2.5)=1x1=1
27\u30010.4\u00d7125\u00d725\u00d70.8=(0.4\u00d725)\u00d7(125\u00d70.8)=10\u00d7100=1000
28\u30011.25\u00d7(8+10)=1.25\u00d78+1.25\u00d710=10+12.5=22.5
29\u30019123-(123+8.8)=9123-123-8.8=9000-8.8=8991.2
30\u30011.24\u00d78.3+8.3\u00d71.76=8.3\u00d7(1.24+1.76)=8.3\u00d73=24.9
31\u30019999\u00d71001=9999\u00d7(1000+1)=9999\u00d71000+9999\u00d71=10008999
32\u300114.8\u00d76.3-6.3\u00d76.5+8.3\u00d73.7=(14.8-6.5)\u00d76.3+8.3\u00d73.7=8.3\u00d76.3+8.3\u00d73.7=8.3\u00d7(6.3+3.7)=8.3\u00d710=83
33\u30011.24+0.78+8.76=(1.24+8.76)+0.78=10+0.78=10.78
34\u3001933-157-43=933-(157+43)=933-200=733
35\u30014821-998=4821-1000+2=3823
36\u300132\u00d7125\u00d725=4\u00d78\u00d7125\u00d725=(4\u00d725)\u00d7(8\u00d7125)=100\u00d71000=100000
37\u30011.8+18\u00f71.5-0.5\u00d70.3=1.8+12-0.15=13.8-0.15=13.65
38\u30016.5\u00d78+3.5\u00d78-47=52+28-47=80-47
39\u30013.7x2.56-2.3=9.472-2.3=7.172
40\u30011.65\u00d799+1.65 =1.65*\uff0899+1\uff09=1.65*100=165
1. 6\u00f7 3/8 \u2013 3/8 \u00f76
=1/6x(3/8-3/8)
=1/6x0
=0
2. 4/7 \u00d7 5/9 + 3/7 \u00d7 5/9
=(4/7+3/7)x5/9
=1x5/9
=5/9
3. 5/2 -\uff08 3/2 + 4/5 \uff09
=5/2-3/2-4/5
=1-4/5
=1/5
4. 6 \u00d7\uff08 1/2 + 2/3 \uff09
=6x1/2+6x2/3
=3+4
=7
5. 8 \u00d7 4/5 + 8 \u00d7 11/5
=8x(4/5+11/5)
=8x3
=24
6. 31 \u00d7 5/6 \u2013 5/6
=(31-1)x5/6
=30x5/6
=25
7. 4/5 \u00d7 25/16 + 2/3 \u00d7 3/4
=5/4+1/2
=5/4+2/4
=7/4
8. 101 \u00d7 1/5 \u2013 1/5 \u00d7 21
=(101-21)x1/5
=80x1/5
=16
脱式计算：
1、62×7.1+2.9
=440.2+2.9
=443.1
2、4.2×0.25
=（4+0.2）×0.25
=4×0.25+0.2×0.25
=1+0.05
=1.05
3、5.2×4.3+0.8×4.3
=（5.2+0.8）×4.3
=6×4.3
=25.8
运算方式
在四则运算中，加法和减法叫做第一级运算，乘法和除法叫做第二级运算。含有两种或两种以上的运算的算式，通常称为混合运算。加、减、乘、除的混合运算也叫做四则混合运算。在四则混合运算中，规定的计算先后次序，称为运算顺序。
1、4×102－2×49
=408-2×49
=408-98
=310
2、25×（2+4）
=25×2+25×4
=50+100
=150
3、12×5+8
=60+8
=68
4、99×101
=99×(100+1)
=99×100+99×1
=9900+99
=9999
5、25×（78×4）
=25×4×78
=100×78
=7800
6、（25＋12）×4
=25×4+12×4
=100+48
=148
7、1.4+0.7+8.6
=(1.4+8.6)+0.7
=10+0.7
=10.7
1、24.6-3.98+5.4-6.02
解析：此题利用加法交换结合律，凑整再计算。步骤如下：
24.6-3.98+5.4-6.02
=（24.6+5.4）-（3.98+6.02）
=30-10
=20
2、27×17/26
解析：此题先用加法分配律，把27转换成（26＋1），再利用乘法结合律，使得运算简便。
27×17/26
＝（26＋1）×17/26
＝26×17/26＋1×17/26
＝17＋17/26
＝17又17/26
3、528-99
解析：利用凑整法和减法结合律计算，先利用凑整法把99变换为（100-1），再运用a-b-c=a-(b+c)来简便计算，步骤如下：
528-99
=528-（100-1）
=528-100+1
=428+1
=429
4、1.2×2.5+0.8×2.5
解析：运用提取公因数的方法，公式：ac+ab=a(b+c)，提取公因数2.5，1.2和0.8相加正好凑整数，使得运算简便。
1.2×2.5+0.8×2.5
=（1.2+0.8）×2.5
=2×2.5
=5
5、2.96×40
解析：此题先利用乘法分配律，把2.96×40转换成29.6x4，再利用乘法结合律来简便计算。
2.96×40
=29.6x4
=（30-0.4）x4
=30×4+0.4×4
=120-1.6
=118.4
1.
4×102－2×49
=408-2×49
=408-98
=310
2.
25×（2+4）
=25×2+25×4
=50+100
=150
3.
12×5+8
=60+8
=68
4.
99×101
=99×(100+1)
=99×100+99×1
=9900+99
=9999
5.
25×（78×4）
=25×4×78
=100×78
=7800
6.
（25＋12）×4
=25×4+12×4
=100+48
=148
7.
1.4+0.7+8.6
=(1.4+8.6)+0.7
=10+0.7
=10.7
8.
56×27＋27×44
=27×(56+44)
=27×100
=2700
9.
56×99＋56
=56×(99+1)
=56×100
=5600
10.
125×25×8×4
=(25×4)×(125×8)
=100×1000
=100000
12.
25×125×4
=(25×4)×125
=100×125
=12500
13.
125×47－47×25
=47×(125－25)
=47×100
=4700
14.
124×38＋65×124＋76×110－76×7
=124×（38＋65）+76×（110－7）
=124×103+76×103
=103×（124＋76）
=103×200
=20600
15.
233-157-43
=233-(157+43)
=233-200
=33
16.
125×32×25
=125×8×4×25
=（125×8）×（4×25）
=1000×100
=100000
17.
1.25×(8+10)
=125×8+125×10
=1000+1250
=2250
18.
99＋99×99
=99×（99+1）
=99×100
=9900
19.
25x(2十8)
=25X10
=250
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