7/9×56+2/9×55,简算.
人气：323 ℃ 时间：2019-11-15 07:10:54
解答
7/9×56+2/9×55
＝7/9×56+2/9×（56-1）
＝7/9×56+2/9×56-2/9
＝（7/9+2/9）x56-2/9
=56-2/9
=55又 7/9
推荐
猜你喜欢
- 在一只装水的烧杯内有一只装水的试管,用酒精灯使烧杯内的水沸腾,试管内的水也会沸腾吗?为什么?
- 土壤中无脊椎动物与其生活环境是如何相适应,相影响的?
- By the time we were sent to the village ,we ___ mostly 16 or 17 years old.
- 在同温同压下,两种物质的量相同的单质气体之间的关系正确的是 B.具有相同的体积 C具有相同的分子数
- 2130201:due to the high pressure of the rate of students and student's physical fitness is in deficiency,the knowledge o
- 求所有德甲球队的英文全名及中文解释（最佳有分）
- for the next two hours she was ___the film .so she didn't notice what happened around her A.engaged
- 均质细长直杆AB的质量为m,长度为l,可在铅垂面内绕A轴转动.若在图示杆与水平线夹角30°处将杆无初速释放,不计轴承处摩擦,试求该瞬时固定铰链支座A处的约束反力.
