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> (1)计算:4+(12)-1-2cos60°+(2-π)0;(2)化简:(x+y)2-x(x+2y)-数学
(1)计算:4+(12)-1-2cos60°+(2-π)0;(2)化简:(x+y)2-x(x+2y)-数学
题目简介
(1)计算:4+(12)-1-2cos60°+(2-π)0;(2)化简:(x+y)2-x(x+2y)-数学
题目详情
(1)计算:
4
+(
1
2
)
-1
-2cos60°+(2-π
)
0
;
(2)化简:(x+y)
2
-x(x+2y)
题型:解答题
难度:中档
来源:盐都区一模
答案
(1)原式=2+2-2×
class="stub"1
2
+1=4-1+1=4;
(2)原式=x2+2xy+y2-x2-2xy
=y2.
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题目简介
(1)计算:4+(12)-1-2cos60°+(2-π)0;(2)化简:(x+y)2-x(x+2y)-数学
题目详情
(2)化简:(x+y)2-x(x+2y)
答案
(2)原式=x2+2xy+y2-x2-2xy
=y2.