问题
解答题
设a、b是实数,且a2+b2-2a+10b+26=0,求
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答案
∵a2+b2-2a+10b+26=0,
∴a2-2a+1+b2+10b+25=0,
∴(a-1)2+(b+5)2=0,
∴a-1=0,b+5=0,
∴a=1,b=-5,
∴
=2a-b
=2×1-(-5)
.7
设a、b是实数,且a2+b2-2a+10b+26=0,求
|
∵a2+b2-2a+10b+26=0,
∴a2-2a+1+b2+10b+25=0,
∴(a-1)2+(b+5)2=0,
∴a-1=0,b+5=0,
∴a=1,b=-5,
∴
=2a-b
=2×1-(-5)
.7