Question

a的相反数是2b-1，b的相反数是3a+1，则a*a+b*b=

Answer 1

-a=2b-1
-b=3a+1
a=-3/5,
b=4/5
a*a+b*b=(-3/5)*(3/5)+(4/5)*(4/5)=1

Answer 2

五分之二

Answer 3

-a=2b-1
-b=3a+1
整理得
a+2b=1 1式
3a+b=-1 2式
1式*3-2式 => 6b-b=3-(-1)=4=>b=4/5 =>a=-2b+1=-2(4/5)+1=-8/5+1=-3/5
a^2+b^2= (4/5)^2+(-3/5)^2=16/25+9/25=1

Answer 4

a的相反数是2b-1，b的相反数是3a+1，则a=1-2b，b=-3a-1，则a=-3/5，b=4/5
a^2+b^2=9/25+16/25=1

Answer 5

-a=2b-1 -b=3a+1解得a=-0.6 b=0.8代入得1

Answer 6

这个简单啊 联立两个方程a=-(2b-1)：b=-(3a+1)
可以解得a=-3/5 b=4/5 则a*a+b*b=1。