题目内容
简便计算(写出主要的简算过程)
①(
+
-
)×36
②1.28+9.8+7.72+10.2.
①(
4 |
9 |
5 |
12 |
7 |
18 |
②1.28+9.8+7.72+10.2.
①(
+
-
)×36,
=
×36+
×36-
×36,
=16+15-14,
=17;
②1.28+9.8+7.72+10.2,
=(1.28+7.72)+(9.8+10.2),
=9+20,
=29.
4 |
9 |
5 |
12 |
7 |
18 |
=
4 |
9 |
5 |
12 |
7 |
18 |
=16+15-14,
=17;
②1.28+9.8+7.72+10.2,
=(1.28+7.72)+(9.8+10.2),
=9+20,
=29.
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