1樓:小豪訊償
(1)25×1.25×32,
=25×1.25×4×8,
=(25×4)×(1.25×8),
=100×10,
=1000;
(2)73.8×16-7.38×60,
=7.38×160-7.38×60,
=7.38×(160-60);
=7.38×100,
=738;
(3)1.25+5 4
×0.4+125%÷5 8
,=1.25+1.25×0.4+1.25×1.6,=1.25×(1+0.4+1.6),
=1.25×3,
=3.75.
用簡便方法計算下列各題 25×(40×32); (5×7)×80; 8×14×125×6; 16×25×5×4; 25×
2樓:是大可愛啦
(1)25×(40×32)
=(25×40)×32
=1000×32
=32000
(2)(5×7)×80
=(5×80)×7
=400×7
=2800
(3)8×14×125×6
=(8×125)×(14×6)
=1000×84
=84000
(4)16×25×5×4
=(16×5)×(25×4)
=90×100
=9000
(5)25×13×4
=(25×4)×13
=100×13
=1300
(6)2843-598
=2843-(600-2)
=2843-600+2
=2245
(7)4×8×25×125
=(4×25)×(8×125)
=100×1000
=100000
(8)259+468+741+532
=(259+741)+(468+532)
=1000+1000
=2000
(9)36×25
=9×4×25
=9×(4×25)
=9×100
=900
(10)12×15+12×35
=12×(15+35)
=12×50
=600
(11)31×128-28×31
=31×(128-28)
=31×100
=3100
(12)(25+250)×4
=25×4+250×4
=100+1000
=1100
(13)(125×125)×8
=125×(125×8)
=125×1000
=125000
(14)(7
12-1 5
)×60
=60×7
12-1 5
×60=35-12
=23(15)4 7
×613
+3 7
×613
=(4 7
+3 7
)×613
=1×6
13 =613
計算下列各題,能簡算的用簡便方法計算.26-3.17-7.83 67×38+33×38 125×25×64 29.38-(19.38-4.76)
3樓:ayの0077e薩
(1)26-3.17-7.83,
=26-(3.17+7.83),
=26-11,
=15;
(2)67×38+33×38,
=(67+33)×38,
=100×38,
=3800;
(3)125×25×64,
=125×25×4×8,
=(125×8)×(25×4),
=1000×100,
=100000;
(4)29.38-(19.38-4.76),=29.38-19.38+4.76,
=10+4.76,
=14.76;
(5)329×87-87×29,
=(329-29)×87,
=300×87,
=26100;
(6)5.8-3.62-0.38+0.2,=(5.8+0.2)-(3.62+0.38),=6-4,=2.
用簡便方法計算下面各題。0.7×0.4×2.5 8.4×0.25 2.5×6.7×0.8
4樓:瓦片
0.7*0.4*2.
5=0.7*1=0.78.
4*0.25=2.1*4*0.
25=2.1*1=2.12.
5*6.7*0.8=2.
5*4*0.2*6.7=10*0.
2*6.72*6.7=13.
436*10.1=36*(10+0.1)=36+3.
6=39.60.68*98=0.
68*(100-2)=68-1.37=66.632.
8*3.7+1.3*2.
8=2.8*(3.7+1.
3)=2.8*5=14
8.2*9.9=8.2*(10-0.1)=82-8.2=73.87.24-2.29-3.7=1.25
3.2*1.25*25=(8*1.25)*(0.4*25)=10*10=100
5樓:匿名使用者
0.7×
0.4×2.5=0.7×(0.4×2.5)=0.7×1=0.7
8.4×0.25=8×0.25+0.4×0.25=2+0.1=2.1
2.5×6.7×0.8=6.7×(專2.5×0.8)=6.7×2=13.4
36×10.1=36×10+36×0.1=360+3.6=363.6
0.68×98=0.68×(100-2)=0.68×100-0.68×2=68-1.36=66.64
2.8×3.7+1.3×2.8=2.8×(3.7+1.3)=2.8×5=14
8.2×9.9=8.2×(10-0.1)=8.2×10-8.2×0.1=82-0.82=81.18
7.24-2.29-3.
7=(7.24+0.01)-(0.
01+2.29)-3.7=7.
25-2.3-3.7=7.
25-(2.3+3.7)=7.
25-6=1.25
3.2×1.25×25=(4×0.8)×屬1.25×25=4×25×0.8×1.25=100×1=100
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