124道简算题题带答案Word下载.docx
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124道简算题题带答案Word下载.docx
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=0.35*(1.6+3.4)
=0.35*5
=1.75
(8)6.72-3.28-1.72
=6.75-(3.28+1.72)
=6.75-5
(9)0.45+6.37+4.55
=0.45+4.55+6.37
=5+6.37
=11.37
(10)28×
12.5-12.5×
20
=(28-20)*12.5
=8*12.5
=100
(11)23.65-(3.07+3.65)
=23.65-3.65-3.07
=20-3.07
=16.93
(12)(4+0.4×
0.25)8×
7×
=(4+1)*7*10
=5*7*10
=350
(13)1.65×
99+1.65
=1.65*(99+1)
=1.65*100
=165
(14)27.85-(7.85+3.4)
=27.85-7.85+3.4
=20+3.4
=23.4
(15)48×
1.25+50×
1.25×
0.2×
8
7.8×
9.9+0.78
=7.8*(9.9+0.1)
=7.8*10
=78
(16)4.8×
46+4.8×
54
=(46+54)*4.8
=100*4.8
=480
(17)673-327-173
=673-(327+173)
=673-500
=173
(18)4.44*2.5
=1.11*(4*2.5)
=1.11*10
=11.1
(19)3.5÷
1.4
=(3.5÷
0.7)÷
(1.4÷
0.7)
=5÷
2
=2.5
(20)1+2+3+4+5......+99+100
=(1+99)+(2+98)+(3+97)+......+(49+51)+50
=(100÷
2-1)*100+50
=4900+50
=4950⑴运用加法交换律进行简便计算。
0.88+5.6+0.121.78+3.5+0.225.6+2.08+14.4
=0.88+0.12+5.6=1.78+0.22+3.5=5.6+14.4+2.08
=1+5.6=2+3.5=20+2.08
=6.6=5.5=22.08
⑵运用加法结合律进行简便计算
2.3+(0.56+4.7)28.6+0.54+0.46+1.45.82+4.56+5.44
=(2.3+4.7)+0.56=(28.6+1.4)+(0.54+0.46)=5.82+(4.56+5.44)
=7+0.56=30+1=5.82+10
=7.56=31=15.82
⑶、运用乘法交换律进行简便计算。
25×
0.37×
0.47.5×
0.39×
46.5×
1.1×
41.25×
3.9×
=25×
0.4×
0.37=7.5×
4×
0.39=6.5×
1.1=1.25×
3.9
=10×
0.37=30×
0.39=26×
1.1=1×
=3.7=11.7=28.6=3.9
⑷、运用乘法结合律进行简便计算。
1.9×
7.5×
86.2×
2.54.3×
1.5×
64.1×
3.5×
=1.9×
(7.5×
8)=6.2×
(0.8×
2.5)=4.3×
(1.5×
6)=4.1×
(3.5×
2)
60=6.2×
2=4.3×
9=4.1×
7
=114=12.4=38.7=28.7
⑸、运用乘法分配律的加法进行简算。
13.6×
4.6+4.6×
6.40.72×
23+77×
0.722.6×
32+32×
2.4
=(13.6+6.4)×
4.6=(23+77)×
0.72=(2.6+2.4)×
32
=20×
6.4=100×
0.72=5×
=128=72=160
⑹、运用乘法分配律的减法进行简算。
12×
5.9-5.9×
24.6×
2.5-2.5×
0.6101×
9.7-9.7
=(12-2)×
5.9=(4.6-0.6)×
2.5=(101-1)×
9.7
5.9=4×
2.5=100×
=59=10=970
⑺、运用减法的运算规律进行简便计算。
1.8-0.45-0.5554.4-4.6-5.435.6-0.13-0.47
=1.8-(0.45+0.55)=54.4-(4.6+5.4)=35.6-(0.13+0.47)
=1.8-1=54.4-10=35.6-0.6
=0.8=44.4=35
⑻、运用除法的运算规律进行简便计算。
4.5÷
4÷
7.514.8÷
1.25÷
818.5÷
1.255.4÷
0.45
=4.5÷
(4×
7.5)=14.8÷
(1.25×
8)=18.5÷
1.25)=5.4÷
0.45)
30=14.8÷
10=18.5÷
5=5.4÷
0.18
=0.15=1.48=3.7=30
⑼综合运用各种运算定律进行简算。
2.54+2.46+0.44+0.5410.7×
0.4-6.7×
0.40.5×
3.2×
=(2.54+2.46)+(0.44+0.54)=(10.7-6.7)×
0.4=(0.5×
4)×
1.25)
=5+1=4×
0.4=2×
1
=6=1.6=2
89.7+5.8-9.7+4.299×
0.38+0.38360÷
(18×
0.4)
=(89.7-9.7)+(5.8+4.2)=(99+1)×
0.38=360÷
18÷
0.4
=80+10=100×
0.38=20÷
0.4
=90=38=50
4.8×
12.52.5×
1.6×
12.53.2×
102
=0.6×
(8×
12.5)=(2.5×
0.2)×
12.5)=3.2×
(100+2)
100=0.5×
100=3.2×
100+3.2×
=60=50=320+6.4
=326.4
=4950
⑴运用加法交换律进行简便计算。
0.88+5.6+0.12=0.88+0.12+5.6=1+5.6=6.6
1.78+3.5+0.22=1.78+0.22+3.5=2+3.5=5.5
5.6+2.08+14.4=5.6+14.4+2.08=20+2.08=22.08
2.3+(0.56+4.7)=(2.3+4.7)+0.56=7+0.56=7.56
28.6+0.54+0.46+1.4=(28.6+1.4)+(0.54+0.46)=30+1=31
5.82+4.56+5.44=5.82+(4.56+5.44)=5.82+10=15.82
0.4=25×
0.37=10×
0.37=3.7
4=7.5×
0.39=30×
0.39=11.7
6.5×
4=6.5×
1.1=26×
1.1=2.86
0.8=1.25×
3.9=1×
3.9=3.9
8=1.9×
8)=1.9×
60=114
6.2×
2.5=6.2×
2.5)=6.2×
2=12.4
4.3×
6=4.3×
6)=4.3×
9=38.7
4.1×
2=4.1×
2)=4.1×
7=28.7
6.4=(13.6+6.4)×
4.6=20×
4.6=92
0.72×
0.72=(23+77)×
0.72=100×
0.72=72
2.6×
2.4=(2.6+2.4)×
32=5×
32=160
2=(12-2)×
5.9=10×
5.9=59
4.6×
0.6=(4.6-0.6)×
2.5=4×
2.5=10
101×
9.7-9.7=(101-1)×
9.7=100×
9.7=970
1.8-0.45-0.55=1.8-(0.45+0.55)=1.8-1=0.8
54.4-4.6-5.4=54.4-(4.6+5.4)=54.4-10=44.4
35.6-0.13-0.47=35.6-(0.13+0.47)=35.6-0.6=35
7.5=4.5÷
7.5)=4.5÷
30=0.15
14.8÷
8=14.8÷
8)=14.8÷
10=1.48
18.5÷
1.25=18.5÷
1.25)=18.5÷
5=3.7
5.4÷
0.45=5.4÷
0.45)=5.4÷
0.18=30
2.54+2.46+0.44+0.54=(2.54+2.46)+(0.44+0.54)=5+1=6
10.7×
0.4=(10.7-6.7)×
0.4=4×
0.4=1.6
0.5×
1.25=(0.5×
1.25)=2×
1=2
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