题目内容
计算下列各式:
(1)1-32-
×[(-5)2×(-
)-240÷(-4)×
];
(2)2×(
+
+
+
+
).
(1)1-32-
| 1 |
| 3 |
| 3 |
| 5 |
| 1 |
| 4 |
(2)2×(
| 3 |
| 5×7 |
| 3 |
| 7×9 |
| 3 |
| 9×11 |
| 3 |
| 11×13 |
| 3 |
| 13×15 |
(1)1-32-
×[(-5)2×(-
)-240÷(-4)×
]
=1-9-
×[25×(-
)-240×(-
)×
]
=1-9-
×(-15+15)
=1-9-0
=-8;
(2)2×(
+
+
+
+
)
=3×(
-
+
-
+
-
+
-
+
-
)
=3×(
-
)
=
.
| 1 |
| 3 |
| 3 |
| 5 |
| 1 |
| 4 |
=1-9-
| 1 |
| 3 |
| 3 |
| 5 |
| 1 |
| 4 |
| 1 |
| 4 |
=1-9-
| 1 |
| 3 |
=1-9-0
=-8;
(2)2×(
| 3 |
| 5×7 |
| 3 |
| 7×9 |
| 3 |
| 9×11 |
| 3 |
| 11×13 |
| 3 |
| 13×15 |
=3×(
| 1 |
| 5 |
| 1 |
| 7 |
| 1 |
| 7 |
| 1 |
| 9 |
| 1 |
| 9 |
| 1 |
| 11 |
| 1 |
| 11 |
| 1 |
| 13 |
| 1 |
| 13 |
| 1 |
| 15 |
=3×(
| 1 |
| 5 |
| 1 |
| 15 |
=
| 2 |
| 5 |
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