题目内容
能简算的要简算.
(1)4.82×12.5×8
(2)18×
-5×
(3)
×998
(4)(8.3×35.7+35.7×1.7)÷3.57.
(1)4.82×12.5×8
(2)18×
| 5 |
| 7 |
| 4 |
| 7 |
(3)
| 1997 |
| 1998 |
(4)(8.3×35.7+35.7×1.7)÷3.57.
(1)4.82×12.5×8,
=4.82×(12.5×8),
=4.82×100,
=482;
(2)18×
-5×
,
=
-
,
=
,
=10;
(3)
×998,
=(1-
)×998,
=1×998-
×998,
=998-
,
=997
;
(4)(8.3×35.7+35.7×1.7)÷3.57,
=(8.3+1.7)×35.7÷3.57,
=10×35.7÷3.57,
=357÷3.57,
=100.
=4.82×(12.5×8),
=4.82×100,
=482;
(2)18×
| 5 |
| 7 |
| 4 |
| 7 |
=
| 90 |
| 7 |
| 20 |
| 7 |
=
| 70 |
| 7 |
=10;
(3)
| 1997 |
| 1998 |
=(1-
| 1 |
| 1998 |
=1×998-
| 1 |
| 1998 |
=998-
| 998 |
| 1998 |
=997
| 500 |
| 999 |
(4)(8.3×35.7+35.7×1.7)÷3.57,
=(8.3+1.7)×35.7÷3.57,
=10×35.7÷3.57,
=357÷3.57,
=100.
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