问题
解答题
计算下列各式: (1)1-32-
(2)2×(
|
答案
(1)1-32-
×[(-5)2×(-1 3
)-240÷(-4)×3 5
]1 4
=1-9-
×[25×(-1 3
)-240×(-3 5
)×1 4
]1 4
=1-9-
×(-15+15)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