welnlwg
幼苗
共回答了15个问题采纳率:73.3% 举报
A={y丨y=x²-2ax+3b},B={y丨y=-x²+2ax+7b},
x²-2ax+3b = =-x²+2ax+7b
2x²-4ax-4b = 0
x²-2ax-2b = 0
x = a + √(a^2+2b)
or a - √(a^2+2b)
ie
a - √(a^2+2b) = 2 ---(1)
a + √(a^2+2b) = 8 ---(2)
(1) +(2)
2a = 10
a = 5 #
from (1)
5- √(25+2b) =2
25+2b = 9
b = -8 #
1年前
2