用简便方法计算. ①7.28-(0.8+3.28) ②73.8-1.64-13.8 ③13.25+5.82+6.75+4.18 ④12.7-4
答案:1 悬赏:10 手机版
解决时间 2021-04-04 07:10
- 提问者网友:低吟詩仙的傷
- 2021-04-03 19:55
用简便方法计算. ①7.28-(0.8+3.28) ②73.8-1.64-13.8 ③13.25+5.82+6.75+4.18 ④12.7-4
最佳答案
- 五星知识达人网友:几近狂妄
- 2021-04-03 20:20
(1)7.28-(0.8+3.28),
=7.28-3.28-0.8,
=4-0.8,
=3.2;
(2)73.8-1.64-13.8,
=73.8-13.8-1.64,
=60-1.64,
=58.36;
(3)13.25+5.82+6.75+4.18,
=(13.25+6.75)+(4.18+5.82),
=20+10,
=30;
(4)12.7-4.8-5.2,
=12.7-(4.8+5.2),
=12.7-10,
=2.7;
(5)3.1+25.78+6.9,
=(3.1+6.9)+25.78,
=10+25.78,
=35.78;
(6)9.7+10.3-6.7,
=(9.7+10.3)-6.7,
=20-6.7,
=13.3.
=7.28-3.28-0.8,
=4-0.8,
=3.2;
(2)73.8-1.64-13.8,
=73.8-13.8-1.64,
=60-1.64,
=58.36;
(3)13.25+5.82+6.75+4.18,
=(13.25+6.75)+(4.18+5.82),
=20+10,
=30;
(4)12.7-4.8-5.2,
=12.7-(4.8+5.2),
=12.7-10,
=2.7;
(5)3.1+25.78+6.9,
=(3.1+6.9)+25.78,
=10+25.78,
=35.78;
(6)9.7+10.3-6.7,
=(9.7+10.3)-6.7,
=20-6.7,
=13.3.
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