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> (1)a•3a+9a-a2-3;(2)945÷315×23223;(3)13+2+12+1-13-1.-数学
(1)a•3a+9a-a2-3;(2)945÷315×23223;(3)13+2+12+1-13-1.-数学
题目简介
(1)a•3a+9a-a2-3;(2)945÷315×23223;(3)13+2+12+1-13-1.-数学
题目详情
(1)a•
3
a
+
9a
-
a
2-
3
;
(2)9
45
÷3
1
5
×
2
3
2
2
3
;
(3)
1
3
+
2
+
1
2
+1
-
1
3
-1
.
题型:解答题
难度:中档
来源:不详
答案
(1)原式=
3a
+3
a
-
a
(2+
3
)
=
3a
+3
a
-2
a
-
3a
=
a
;
(2)原式=(9÷3)×
45×5
×
class="stub"2
3
×
class="stub"2
3
6
=20
6
;
(3)原式=
3
-
2
+
2
-1
-
3
+1
2
=
2
3
-2-
3
-1
2
=
3
-3
2
.
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题目简介
(1)a•3a+9a-a2-3;(2)945÷315×23223;(3)13+2+12+1-13-1.-数学
题目详情
(2)9
(3)
答案
(2)原式=(9÷3)×
(3)原式=