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简便计算3.1+25.78+6.912.7-4.8-5.234.82-(4.82+15.2)15.25+4.72+4.75+5.28.
题目详情
简便计算 3.1+25.78+6.9 | 12.7-4.8-5.2 |
34.82-(4.82+15.2) | 15.25+4.72+4.75+5.28. |
▼优质解答
答案和解析
(1)3.1+25.78+6.9,
=(3.1+6.9)+25.78,
=10+25.78,
=35.78;
(2)12.7-4.8-5.2,
=12.7-(4.8+5.2),
=12.7-10,
=2.7;
(3)34.82-(4.82+15.2),
=34.82-4.82-15.2,
=30-15.2,
=14.8;
(4)15.25+4.72+4.75+5.28,
=(15.25+4.75)+(4.72+5.28),
=20+10,
=30.
=(3.1+6.9)+25.78,
=10+25.78,
=35.78;
(2)12.7-4.8-5.2,
=12.7-(4.8+5.2),
=12.7-10,
=2.7;
(3)34.82-(4.82+15.2),
=34.82-4.82-15.2,
=30-15.2,
=14.8;
(4)15.25+4.72+4.75+5.28,
=(15.25+4.75)+(4.72+5.28),
=20+10,
=30.
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