计算下面各题,怎样简便就怎样计算. 984-376-124 2475-1126+874 65+35-65+35 875+139+25 7
计算下面各题,怎样简便就怎样计算.984-376-1242475-1126+87465+35-65+35875+139+25719-458+281871+3515+448...
计算下面各题,怎样简便就怎样计算. 984-376-124 2475-1126+874 65+35-65+35 875+139+25 719-458+281 871+3515+4485+129.
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(1)984-376-124
=984-(376+124)
=984-500
=484;
(2)2475-1126+874
=2475-(1126-1)+(874+1)
=2475-1125+875
=2350+875
=3225;
(3)65+35-65+35
=65-65+(35+35)
=0+70
=70;
(4)875+139+25
=875+25+139
=900+139
=1039;
(5)719-458+281
=719+281-458
=1000-458
=542;
(6)871+3515+4485+129
=(871+129)+(3515+4485)
=1000+8000
=9000.
=984-(376+124)
=984-500
=484;
(2)2475-1126+874
=2475-(1126-1)+(874+1)
=2475-1125+875
=2350+875
=3225;
(3)65+35-65+35
=65-65+(35+35)
=0+70
=70;
(4)875+139+25
=875+25+139
=900+139
=1039;
(5)719-458+281
=719+281-458
=1000-458
=542;
(6)871+3515+4485+129
=(871+129)+(3515+4485)
=1000+8000
=9000.
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