用简便方法计算下面各题 425+14+186 67+25+33+75 103×12 2000÷125÷8 250×13×4 99×38+38
用简便方法计算下面各题425+14+18667+25+33+75103×122000÷125÷8250×13×499×38+38....
用简便方法计算下面各题 425+14+186 67+25+33+75 103×12 2000÷125÷8 250×13×4 99×38+38.
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(1)425+14+186
=425+(14+186)
=425+200
=625;
(2)67+25+33+75
=67+33+(75+25)
=100+100
=200;
(3)103×12
=100×12+3×12
=1200+36
=1236;
(4)2000÷125÷8
=2000÷(125×8)
=2000÷1000
=2;
(5)250×13×4
=250×4×13
=1000×13
=13000;
(6)99×38+38
=(99+1)×38
=100×38
=3800.
=425+(14+186)
=425+200
=625;
(2)67+25+33+75
=67+33+(75+25)
=100+100
=200;
(3)103×12
=100×12+3×12
=1200+36
=1236;
(4)2000÷125÷8
=2000÷(125×8)
=2000÷1000
=2;
(5)250×13×4
=250×4×13
=1000×13
=13000;
(6)99×38+38
=(99+1)×38
=100×38
=3800.
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