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9的平方根为±3±3;当a>2时,(2−a)2=;若a−8+(b+27)2=0,则3a+3b=.

题目详情
9
的平方根为
±
3
±
3
; 当a>2时,
(2−a)2
=______;若
a−8
+(b+27)2=0,则
3a
+
3b
=______.
9
的平方根为
±
3
±
3
; 当a>2时,
(2−a)2
=______;若
a−8
+(b+27)2=0,则
3a
+
3b
=______.
9
9
9
±
3
3
3
3
3
±
3
3
3
3
3
(2−a)2
=______;若
a−8
+(b+27)2=0,则
3a
+
3b
=______.
(2−a)2
(2−a)2
(2−a)2)2)22
a−8
+(b+27)2=0,则
3a
+
3b
=______.
a−8
a−8
a−82
3a
+
3b
=______.
3a
3a3a
3b
=______.
3b
3b3b
▼优质解答
答案和解析
9
=3,
9
的平方根为±
3

∵a>2,
∴2-a<0,
(2−a)2
=|2-a|=a-2;
a−8
+(b+27)2=0,
∴a-8=0,b+27=0,
∴a=8,b=-27;
3a
+
3b
=
38
+
3−27
=2-3=-1.
故答案为±
3
,a-2,-1.
9
9
99=3,
9
的平方根为±
3

∵a>2,
∴2-a<0,
(2−a)2
=|2-a|=a-2;
a−8
+(b+27)2=0,
∴a-8=0,b+27=0,
∴a=8,b=-27;
3a
+
3b
=
38
+
3−27
=2-3=-1.
故答案为±
3
,a-2,-1.
9
9
99的平方根为±
3

∵a>2,
∴2-a<0,
(2−a)2
=|2-a|=a-2;
a−8
+(b+27)2=0,
∴a-8=0,b+27=0,
∴a=8,b=-27;
3a
+
3b
=
38
+
3−27
=2-3=-1.
故答案为±
3
,a-2,-1.
3
3
33,
∵a>2,
∴2-a<0,
(2−a)2
=|2-a|=a-2;
a−8
+(b+27)2=0,
∴a-8=0,b+27=0,
∴a=8,b=-27;
3a
+
3b
=
38
+
3−27
=2-3=-1.
故答案为±
3
,a-2,-1.
(2−a)2
(2−a)2
(2−a)2(2−a)22=|2-a|=a-2;
a−8
+(b+27)2=0,
∴a-8=0,b+27=0,
∴a=8,b=-27;
3a
+
3b
=
38
+
3−27
=2-3=-1.
故答案为±
3
,a-2,-1.
a−8
a−8
a−8a−8+(b+27)22=0,
∴a-8=0,b+27=0,
∴a=8,b=-27;
3a
+
3b
=
38
+
3−27
=2-3=-1.
故答案为±
3
,a-2,-1.
3a
3a33aa
+
3b
=
38
+
3−27
=2-3=-1.
故答案为±
3
,a-2,-1.
3b
3b33bb
=
38
+
3−27
=2-3=-1.
故答案为±
3
,a-2,-1.
38
383388
+
3−27
=2-3=-1.
故答案为±
3
,a-2,-1.
3−27
3−2733−27−27
=2-3=-1.
故答案为±
3
,a-2,-1.
3
3
33,a-2,-1.