用简便方法计算下列各题 25×(40×32); (5×7)×80; 8×14×125×6; 16×25×5×4; 25×
用简便方法计算下列各题25×(40×32);(5×7)×80;8×14×125×6;16×25×5×4;25×13×4;2843-598;4×8×25×125;259+4...
用简便方法计算下列各题 25×(40×32); (5×7)×80; 8×14×125×6; 16×25×5×4; 25×13×4; 2843-598; 4×8×25×125; 259+468+741+532; 36×25; 12×15+12×35; 31×128-28×31; (25+250)×4; (125×125)×8; ( 7 12 - 1 5 )×60; 4 7 × 6 13 + 3 7 × 6 13 .
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(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)(
=60×
=35-12 =23 (15)
=(
=1×
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