(1)计算:23-1+27-(3-1)0;(2)计算:1+cos30°sin60°•tan60°;(3)解方程:x(x+8)=16.-数学

题目简介

(1)计算:23-1+27-(3-1)0;(2)计算:1+cos30°sin60°•tan60°;(3)解方程:x(x+8)=16.-数学

题目详情

(1)计算:
2
3
-1
+
27
-(
3
-1)0

(2)计算:
1+cos30°
sin60°
•tan60°

(3)解方程:x(x+8)=16.
题型:解答题难度:中档来源:不详

答案

(1)class="stub"2
3
-1
+
27
-(
3
-1)0
=
3
+1-3
3
-1=-2
3

(2)class="stub"1+cos30°
sin60°
•tan60°
=
1+
3
2
class="stub"1
2
×
3
=(2+
3
)×
3
=2
3
+3;
(3)x(x+8)=16
x2+8x=16,
x2+8x+16=16+16,
(x+4)2=32,
x+4=±4
2

x1=-4+4
2
,x2=-4-4
2

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