把b-n看成整体t
相当于(4/3*t+5)^2+t^2
=16/9*t^2+40/3*t+25+t^2
=25/9*t^2+40/3*t+25
已知3m+4n-7=0,3a+4b+8=0,则根号[(m-a)^2+(n-b)^2]的最小值为……
已知3m+4n-7=0,3a+4b+8=0,则根号[(m-a)^2+(n-b)^2]的最小值为……
为什么[4(b-n)/3+5]^2+(n-b)^2=25/9(b-n)^2+40(b-n)/3+25
为什么[4(b-n)/3+5]^2+(n-b)^2=25/9(b-n)^2+40(b-n)/3+25
数学人气:182 ℃时间:2020-01-27 18:18:41
优质解答
我来回答
类似推荐
猜你喜欢
- 1Two-thirds of the students come from the USA.(对划线部分提问) 划在Two-thirds
- 2It's a long time since i saw you last.
- 3They will send their homework to the teachers (by emil)对括号部分提问
- 4求y=(1+ x的立方)10的指数的导数
- 5The earth moves around the sun in 365 1/4 days.---这句话里的“365
- 6等比数列{an}的前n项和是Sn,若S30=13S10,S10+S30=140,则S20的值是_.
- 7已知3次根号下5x-3与3次根号下3-2y互为相反数,求(3x-5y)/(4x+2y)的值.
- 8英语翻译
- 9设等差数列(an)的前n项和为Sn,已知a3=12,且S12小于0,S13大于0.(1)求公差d的范围.(2)问前几项
- 10有关春节 词语 对联 诗句