题目内容
计算下面各题,怎样简便就怎样计算.
①
×
+
×
②87×
③
×7
+3
×25%-
④(
-40%)÷
×
.
①
| 11 |
| 8 |
| 7 |
| 9 |
| 7 |
| 9 |
| 7 |
| 18 |
②87×
| 3 |
| 86 |
③
| 1 |
| 4 |
| 5 |
| 7 |
| 2 |
| 7 |
| 1 |
| 4 |
④(
| 7 |
| 5 |
| 2 |
| 5 |
| 5 |
| 4 |
①
×
+
×
=(
+
)×
,
=1×
,
=
;
②87×
=(86+1)×
,
=86×
+
,
=3+
,
=3
;
③
×7
+3
×25%-
=
×7
+3
×
-
,
=(7
+3
-1)×
,
=10×
,
=
;
④(
-40%)÷
×
=(1.4-0.4)×
×
,
=1×
×
,
=
.
| 11 |
| 8 |
| 7 |
| 9 |
| 7 |
| 9 |
| 7 |
| 18 |
=(
| 11 |
| 18 |
| 7 |
| 18 |
| 7 |
| 9 |
=1×
| 7 |
| 9 |
=
| 7 |
| 9 |
②87×
| 3 |
| 86 |
=(86+1)×
| 3 |
| 86 |
=86×
| 3 |
| 86 |
| 3 |
| 86 |
=3+
| 3 |
| 86 |
=3
| 3 |
| 86 |
③
| 1 |
| 4 |
| 5 |
| 7 |
| 2 |
| 7 |
| 1 |
| 4 |
=
| 1 |
| 4 |
| 5 |
| 7 |
| 2 |
| 7 |
| 1 |
| 4 |
| 1 |
| 4 |
=(7
| 5 |
| 7 |
| 2 |
| 7 |
| 1 |
| 4 |
=10×
| 1 |
| 4 |
=
| 5 |
| 2 |
④(
| 7 |
| 5 |
| 2 |
| 5 |
| 5 |
| 4 |
=(1.4-0.4)×
| 5 |
| 2 |
| 5 |
| 4 |
=1×
| 5 |
| 2 |
| 5 |
| 4 |
=
| 25 |
| 8 |
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