Express (a) 2.149 correct to one decimal place,(b) 408 corre

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Express
(a) 2.149 correct to one decimal place,
(b) 408 correct to two significant figures,
(c) 0.0054 in standard form,
(d) 786 mm in cm,giving your answer correct to the nearest cm
3.Given that 2 £ a £ 5 and –7 £ b £ –3,find
(a) the greatest possible value of a – b,
(b) the least possible value of a2 + b2.
£ 意思是大于等于
最后一题的那个2是平方.
按照incisor的那个问题解释.ssport720就不对了吧答案?

Express
(a) 2.149 correct to one decimal place,
把2.149精确到一位小数》79cm
3.Given that 2 £ a £ 5 and –7 £ b £ –3,find如果2小于等于A小于等于5,-7小于等于B小于等于-3
(a) the greatest possible value of a – b,求A-B的最大值
因为-7小于等于B小于等于-3,
所以3小于等于-B小于等于7————————————（1）
又因为2小于等于A小于等于5——————————（2）
由（1）（2）相加得A-B小于等于12
故A-B的最大值为12,此时A=5,B=7
(b) the least possible value of a2 + b2.求A平方+B平方的最小值
画一个数轴,以A为横轴,B为纵轴,由题目标出AB的范围为一个矩形的定义域
A的平方+B的平方的值为定义域上的点到原点的距离的平方
故A的平方+B的平方的最小值为13,此时A=2,B=3
楼主,你明白了吗?我可能解释得还是不太清楚,但我尽力了,在电脑上表达数学真难啊!希望可以帮到你.

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