题目内容
计算,能简算的要简算.
| 7.27-(1.98+0.27) | 23.4×18-23.4×8 | 83×
| ||||||
1999÷1998×
|
|
(1)7.27-(1.98+0.27),
=7.27-0.27-1.98,
=7-1.98,
=5.02;
(2)23.4×18-23.4×8,
=23.4×(18-8),
=23.4×10,
=234;
(3)83×
+2÷
-
,
=83×
+2×
-
,
=(83+2-1)×
,
=84×
,
=60;
(4)1999÷1998×
,
=
×
,
=1;
(5)
×101-
,
=
×(101-1),
=
×100,
=39.
=7.27-0.27-1.98,
=7-1.98,
=5.02;
(2)23.4×18-23.4×8,
=23.4×(18-8),
=23.4×10,
=234;
(3)83×
| 5 |
| 7 |
| 7 |
| 5 |
| 5 |
| 7 |
=83×
| 5 |
| 7 |
| 5 |
| 7 |
| 5 |
| 7 |
=(83+2-1)×
| 5 |
| 7 |
=84×
| 5 |
| 7 |
=60;
(4)1999÷1998×
| 1998 |
| 1999 |
=
| 1999 |
| 1998 |
| 1998 |
| 1999 |
=1;
(5)
| 39 |
| 100 |
| 39 |
| 100 |
=
| 39 |
| 100 |
=
| 39 |
| 100 |
=39.
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