计算或化简:(1)15×53(2)x3+x2y(x≥0,y≥0)(3)24(23+273)(4)7a8a-2a218a+7a2a.-数学

题目简介

计算或化简:(1)15×53(2)x3+x2y(x≥0,y≥0)(3)24(23+273)(4)7a8a-2a218a+7a2a.-数学

题目详情

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
题型:解答题难度:中档来源:不详

答案

(1)
15
×
class="stub"5
3
=
15×class="stub"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
-class="stub"a
2
2a
+7a
2a

=class="stub"41a
2
2a

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