人气:385 ℃ 时间:2020-05-22 07:35:29
解答
a
2-4a+9b
2+6b+5=(a-2)
2+(3b+1)
2=0,
∴a-2=0,3b+1=0,即a=2,b=-
,
则原式=
+3=3
.
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