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> (1)计算:(π-4)0+sin45°+(-12)-2-25;(2)先化简,再求值:a2a-3+93-a(其中a=5-3).-数学
(1)计算:(π-4)0+sin45°+(-12)-2-25;(2)先化简,再求值:a2a-3+93-a(其中a=5-3).-数学
题目简介
(1)计算:(π-4)0+sin45°+(-12)-2-25;(2)先化简,再求值:a2a-3+93-a(其中a=5-3).-数学
题目详情
(1)计算:(π-4)
0
+sin45°+
(-
1
2
)
-2
-
25
;
(2)先化简,再求值:
a
2
a-3
+
9
3-a
(其中a=
5
-3
).
题型:解答题
难度:中档
来源:雅安
答案
(1)原式=1+
2
2
+4-5=
2
2
;
(2)原式=
a
2
a-3
-
class="stub"9
a-3
=
a
2
-9
a-3
=
(a+3)(a-3)
a-3
=a+3,
当a=
5
-3时,原式=
5
-3+3=
5
.
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题目简介
(1)计算:(π-4)0+sin45°+(-12)-2-25;(2)先化简,再求值:a2a-3+93-a(其中a=5-3).-数学
题目详情
(2)先化简,再求值:
答案
(2)原式=
当a=