问题
解答题
用简便方法计算下列各题
|
答案
(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
)×601 5
=60×
-7 12
×601 5
=35-12
=23
(15)
×4 7
+6 13
×3 7 6 13
=(
+4 7
)×3 7 6 13
=1×6 13
=6 13