题目内容
| 脱式计算(后三个用简便方法计算) 1-
|
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| 89×
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|
|
(1)1-
×
=1-
=
;
(2)
×0.375÷
=
×
×
=
;
(3)
÷[(
+
)×15]
=
÷[
×15+
×15]
=
÷[10+3]
=
÷13
=
×
=
;
(4)89×
=(88+1)×
=88×
+
=3+
=3
;
(5)
×
×
=
;
(6)
×
+
×
=(
+
)×
=
×
=
.
| 5 |
| 7 |
| 14 |
| 15 |
=1-
| 2 |
| 3 |
=
| 1 |
| 3 |
(2)
| 2 |
| 9 |
| 6 |
| 7 |
=
| 2 |
| 9 |
| 3 |
| 8 |
| 7 |
| 6 |
=
| 7 |
| 72 |
(3)
| 1 |
| 5 |
| 2 |
| 3 |
| 1 |
| 5 |
=
| 1 |
| 5 |
| 2 |
| 3 |
| 1 |
| 5 |
=
| 1 |
| 5 |
=
| 1 |
| 5 |
=
| 1 |
| 5 |
| 1 |
| 13 |
=
| 1 |
| 65 |
(4)89×
| 3 |
| 88 |
=(88+1)×
| 3 |
| 88 |
=88×
| 3 |
| 88 |
| 3 |
| 88 |
=3+
| 3 |
| 88 |
=3
| 3 |
| 88 |
(5)
| 7 |
| 9 |
| 5 |
| 6 |
| 3 |
| 7 |
| 5 |
| 18 |
(6)
| 4 |
| 11 |
| 11 |
| 6 |
| 5 |
| 11 |
| 11 |
| 6 |
=(
| 4 |
| 11 |
| 5 |
| 11 |
| 11 |
| 6 |
=
| 9 |
| 11 |
| 11 |
| 6 |
=
| 3 |
| 2 |
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