试题与答案

(1)(48+20)+(12-5)(2)(8x+18x)•2x.

题型:解答题

题目:

(1)(
48
+
20
)+(
12
-
5
)

(2)(
8x
+
18x
2x

答案:

(1)原式=4

3
+2
5
+2
3
-
5

=6

3
+
5

(2)原式=(2

2x
+3
2x
)•
2x

=5

2x
2x

=5•2x

=10x.

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题型:填空题



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