题目内容
能简算的要简算.
÷
+
+
×(
+
)+
78×
÷(
+
)
| 1 |
| 3 |
| 4 |
| 9 |
| 1 |
| 3 |
| 1 |
| 4 |
| 12 |
| 5 |
| 5 |
| 6 |
| 3 |
| 4 |
| 4 |
| 5 |
| 3 |
| 79 |
| 2 |
| 15 |
| 3 |
| 4 |
| 2 |
| 15 |
①
÷
+
+
=
×
+
+
=
+
+
=1+
=1
;
②
×(
+
)+
=
×
+
×
+
=2+
+
=2+(
+
)
=2+
=2+2
=4
;
③78×
=(79-1)×
=79×
-1×
=3-
=2
;
④
÷(
+
)
=
÷(
+
)
=
÷
=
×
=
.
| 1 |
| 3 |
| 4 |
| 9 |
| 1 |
| 3 |
| 1 |
| 4 |
=
| 1 |
| 3 |
| 9 |
| 4 |
| 1 |
| 3 |
| 1 |
| 4 |
=
| 3 |
| 4 |
| 1 |
| 4 |
| 1 |
| 3 |
=1+
| 1 |
| 3 |
=1
| 1 |
| 3 |
②
| 12 |
| 5 |
| 5 |
| 6 |
| 3 |
| 4 |
| 4 |
| 5 |
=
| 12 |
| 5 |
| 5 |
| 6 |
| 12 |
| 5 |
| 3 |
| 4 |
| 4 |
| 5 |
=2+
| 9 |
| 5 |
| 4 |
| 5 |
=2+(
| 9 |
| 5 |
| 4 |
| 5 |
=2+
| 13 |
| 5 |
=2+2
| 3 |
| 5 |
=4
| 3 |
| 5 |
③78×
| 3 |
| 79 |
=(79-1)×
| 3 |
| 79 |
=79×
| 3 |
| 79 |
| 3 |
| 79 |
=3-
| 3 |
| 79 |
=2
| 76 |
| 79 |
④
| 2 |
| 15 |
| 3 |
| 4 |
| 2 |
| 15 |
=
| 2 |
| 15 |
| 45 |
| 60 |
| 8 |
| 60 |
=
| 2 |
| 15 |
| 53 |
| 60 |
=
| 2 |
| 15 |
| 60 |
| 53 |
=
| 8 |
| 53 |
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