GMAT
which of the following fractions has a decimal equivalent that is a terminating decimal?
a.10/189 b.15/196 c.16/225 d.25/144 e.39/128
时间来不及的!
人气:208 ℃ 时间:2020-02-05 16:12:34
解答
Notice:
1/2 = 0.5 (good)
1/3 = 0.3333.(bad)
1/4 = 0.25 (good)
1/5 = 0.2 (good)
1/6 = 0.16666...(bad)
1/7 = 0.142857142857...(bad)
1/8 = 0.125 (good)
1/9 = 0.11111...(bad)
1/10 = 0.1 (good)
1/11 = 0.0909...(bad)
etc.
189 --> 1 + 8 + 9 = 18 (multiple of 3)
196 --> 2 x 2 x 7 x 7 (multiple of 7)
225 --> 2 + 2 + 5 = 9 (multiple of 3)
144 --> 1 + 1 + 4 = 6 (multiple of 3)
128 --> 2 x 2 x 2 x 2 x 2 x 2 x 2
128 has only factors of 2 (or 5).
Answer:
E.39/128
推荐
- if n is a positive integer,what is the remainder when 3^(8n+3) + 2 is divided by
- GMAT
- 1.If the average (arithmetic mean) of 3,8,and w is greater than or equal to 7 and less than or equal to 44,what is the g
- GMAT数学求解
- if n is a positive integer,how many of the ten digits from 0 through 9 could be the units digit of n^3?
- NaBH4+2H2O==NaBO2+4H2↑,
- 7个月饼12人分每人2块,怎么平均分完 小孩在请教我.
- 解直角三角形 在RT△ABC中,∠C=90°,∠A=60°,S=12根号3
猜你喜欢
- 某物体质量为3kg,受到三个共点力的作用,其中F1=6N,F2=7N,F3=8N,则物体的加速度不可能是
- 六年纪数学题,下午就要交啊( ⊙ o ⊙
- 已知双曲线的离心率为2 ,焦点是(-4,0)(4,0),则双曲线方程为多少?
- 下面函数定义正确的是_________.
- 人在钢管一端敲击一下,在另一端听到两次声音的时间间隔为一秒,求钢管的长度.
- 【英语作文】某中学八年级五班的同学正在开展以“should friends be the same or different”为主题的班会,请根据下面信息谈谈你的观点(80词)
- 用“即使.假如.”和“排比”的句式写几句话.
- 一道数学题,一辆汽车从甲地到乙地.4小时行驶了全程的5分之2,还差58千米就到终点.请问这驾车每小时行驶