
只要化简比,谢谢
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2017-10-30 · 知道合伙人教育行家

知道合伙人教育行家
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1981年8月铁岭县凡河中学任教英语85年2月任教化学学2008年9月凡河九年一贯制学校2010年10月任教莲花中学
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5、
12 :21 = 4 :7
5/6 : 2 = 5 : 12
1/5 :1/20 = 20 :5 = 4
0.6 :0.7 = 6 :7
0.25 :1 =1 :4
0.2 :5/6 = 1.2 :5 = 6 :25
6、
0.08 :1/2 = 0.16
1/2 :1/3 = 3 :2 = 1.5
2/5 :4 = 1/10 = 0.1
7/6 :31/12 = 14/31
21 :24 = 7/8 = 0.875
0.75 :0.625 = 750 :625 = 1.2
7、
(1)甲乙队合作完成需要:1 / (1/20 + 1/30) = 1 / 5/60 = 12(天)
(2)[1 - 4 x (1/20 + 1/30)] / 1/30 = [1 - 4 x 1/12] / 1/30 = 2/3 x 12 = 8(天)
(3)[1 - 4 x 1/20] / (1/20 + 1/30) = [1 - 1/5] / 1/12 = 4/5 x 12 = 9.6(天)
12 :21 = 4 :7
5/6 : 2 = 5 : 12
1/5 :1/20 = 20 :5 = 4
0.6 :0.7 = 6 :7
0.25 :1 =1 :4
0.2 :5/6 = 1.2 :5 = 6 :25
6、
0.08 :1/2 = 0.16
1/2 :1/3 = 3 :2 = 1.5
2/5 :4 = 1/10 = 0.1
7/6 :31/12 = 14/31
21 :24 = 7/8 = 0.875
0.75 :0.625 = 750 :625 = 1.2
7、
(1)甲乙队合作完成需要:1 / (1/20 + 1/30) = 1 / 5/60 = 12(天)
(2)[1 - 4 x (1/20 + 1/30)] / 1/30 = [1 - 4 x 1/12] / 1/30 = 2/3 x 12 = 8(天)
(3)[1 - 4 x 1/20] / (1/20 + 1/30) = [1 - 1/5] / 1/12 = 4/5 x 12 = 9.6(天)
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