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> 解答下列各题(1)计算:8+(-12)-1-4sin30°+(3-2010)0(2)已知a=3,b=-1,求3+a2-b2a2-ab÷12a的值.-数学
解答下列各题(1)计算:8+(-12)-1-4sin30°+(3-2010)0(2)已知a=3,b=-1,求3+a2-b2a2-ab÷12a的值.-数学
题目简介
解答下列各题(1)计算:8+(-12)-1-4sin30°+(3-2010)0(2)已知a=3,b=-1,求3+a2-b2a2-ab÷12a的值.-数学
题目详情
解答下列各题
(1)计算:
8
+(-
1
2
)
-1
-4sin30°+(
3
-2010
)
0
(2)已知a=3,b=-1,求
3+
a
2
-
b
2
a
2
-ab
÷
1
2a
的值.
题型:解答题
难度:中档
来源:不详
答案
(1)原式=2
2
-2-4×
class="stub"1
2
+1
=2
2
-3;
(2)原式=3+
(a+b)(a-b)
a(a-b)
•2a
=3+2(a+b),
∵a=3,b=-1,
∴a+b=2,
∴原式=3+2(a+b)=7.
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题目简介
解答下列各题(1)计算:8+(-12)-1-4sin30°+(3-2010)0(2)已知a=3,b=-1,求3+a2-b2a2-ab÷12a的值.-数学
题目详情
(1)计算:
(2)已知a=3,b=-1,求3+
答案
=2
(2)原式=3+
=3+2(a+b),
∵a=3,b=-1,
∴a+b=2,
∴原式=3+2(a+b)=7.