问题 填空题
化简:
225×0.04
=______,
1172-1082
=______.
2xy
-
8y
=______,
12
-
27
=______.
答案

225×0.04
=
225
×
0.04
=15×0.2=3,

1172-1082
=
(117+108)(117-108)
=
225
×
9
=15×3=45.

2xy
-
8y
=
2xy
-2
2y

12
-
27
=2
3
-3
3
=-
3

故答案为:3、45、

2xy
-2
2y
、-
3

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