题目内容
简便计算
×
+
×
+
×
×15×9
(
-
)×18.
5 |
8 |
3 |
4 |
1 |
4 |
5 |
8 |
5 |
8 |
14 |
15 |
2 |
9 |
(
8 |
9 |
5 |
6 |
①
×
+
×
+
=
×(
+
+1)
=
×2
=1
;
②
×
×15×9
=(
×15)×(
×9)
=14×2
=28;
③(
-
)×18
=
×18-
×18
=16-15
=1.
5 |
8 |
3 |
4 |
1 |
4 |
5 |
8 |
5 |
8 |
=
5 |
8 |
3 |
4 |
1 |
4 |
=
5 |
8 |
=1
1 |
4 |
②
14 |
15 |
2 |
9 |
=(
14 |
15 |
2 |
9 |
=14×2
=28;
③(
8 |
9 |
5 |
6 |
=
8 |
9 |
5 |
6 |
=16-15
=1.
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