题目内容
计算下面各题,能简算的要简算.
(1)(
+
)÷
(2)50×
÷
×
(3)
×99+
(4)
-[(
+
)×
]
(5)98×
(6)21-
×21.
(1)(
| 7 |
| 8 |
| 13 |
| 16 |
| 13 |
| 16 |
(2)50×
| 1 |
| 5 |
| 1 |
| 500 |
| 1 |
| 5000 |
(3)
| 44 |
| 45 |
| 44 |
| 45 |
(4)
| 5 |
| 8 |
| 1 |
| 2 |
| 3 |
| 5 |
| 5 |
| 11 |
(5)98×
| 2 |
| 97 |
(6)21-
| 19 |
| 20 |
(1)(
+
)÷
,
=
×
,
=
;
(2)50×
÷
×
,
=50×
×500×
,
=1;
(3)
×99+
,
=
×(99+1),
=
×100,
=97
;
(4)
-[(
+
)×
],
=
-[
×
],
=
-
,
=
;
(5)98×
,
=(97+1)×
,
=97×
+1×
,
=2+
,
=2
;
(6)21-
×21,
=(1-
)×21,
=
×21,
=
.
| 7 |
| 8 |
| 13 |
| 16 |
| 13 |
| 16 |
=
| 27 |
| 16 |
| 16 |
| 13 |
=
| 27 |
| 13 |
(2)50×
| 1 |
| 5 |
| 1 |
| 500 |
| 1 |
| 5000 |
=50×
| 1 |
| 5 |
| 1 |
| 5000 |
=1;
(3)
| 44 |
| 45 |
| 44 |
| 45 |
=
| 44 |
| 45 |
=
| 44 |
| 45 |
=97
| 7 |
| 9 |
(4)
| 5 |
| 8 |
| 1 |
| 2 |
| 3 |
| 5 |
| 5 |
| 11 |
=
| 5 |
| 8 |
| 11 |
| 10 |
| 5 |
| 11 |
=
| 5 |
| 8 |
| 1 |
| 2 |
=
| 1 |
| 8 |
(5)98×
| 2 |
| 97 |
=(97+1)×
| 2 |
| 97 |
=97×
| 2 |
| 97 |
| 2 |
| 97 |
=2+
| 2 |
| 97 |
=2
| 2 |
| 97 |
(6)21-
| 19 |
| 20 |
=(1-
| 19 |
| 20 |
=
| 1 |
| 20 |
=
| 21 |
| 20 |
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