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计算下列各题(能简算要简算).9000÷125÷81900-900÷75+257200÷36+64×2835×125×1678×63-78+38×78(480+120÷15)×50630÷35131+132+133+134+135+136+137+138+139

题目详情
计算下列各题(能简算要简算).
9000÷125÷8        
1900-900÷75+25         7200÷36+64×28
35×125×16           78×63-78+38×78        (480+120÷15)×50
630÷35                131+132+133+134+135+136+137+138+139.
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答案和解析
(1)9000÷125÷8,
=9000÷(125×8),
=9000÷1000,
=9;

(2)1900-900÷75+25,
=1900-12+25,
=1888+25,
=1913;

(3)7200÷36+64×28,
=200+1792,
=1992;

(4)35×125×16,
=35×125×2×8,
=(35×2)×(125×8),
=70×1000,
=70000;

(5)78×63-78+38×78,
=78×(63-1+38),
=78×100,
=7800;

(6)(480+120÷15)×50,
=(480+8)×50,
=480×50+8×50,
=24000+400,
=24400;

(7)630÷35,
=630÷7÷5,
=90÷5,
=18;

(8)131+132+133+134+135+136+137+138+139,
=(131+139)+(321+138)+(133+137)+(134+136)+135,
(131+139)×4+135,
=270×4+135,
=1080+135,
=1215.