问题 解答题
计算或化简:
(1)
15
×
5
3

(2)
x3+x2y
(x≥0,y≥0)

(3)
24
(2
3
+
27
3
)

(4)7a
8a
-2a2
1
8a
+7a
2a
答案

(1)

15
×
5
3
=
15×
5
3

=

25
=5;

(2)

x3+x2y
=
x2(x+y)

=x

x+y

(3)原式=

24
×3
3
=18
2

(4)原式=14a

2a
-
a
2
2a
+7a
2a

=

41a
2
2a

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