1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)
2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.
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