问题
解答题
计算: (1)(-18)-(-5)+(-2)-(+15); (2)-2.5÷
(3)(-3)2×[-
|
答案
(1)(-18)-(-5)+(-2)-(+15)
=-18+5-2-15
=-35+5
=-30;
(2)-2.5÷
×(-5 8
)1 4
=
×5 2
×8 5 1 4
=1;
(3)(-3)2×[-
+(-2 3
]5 9)
=9×[-
]11 9
=-11.
计算: (1)(-18)-(-5)+(-2)-(+15); (2)-2.5÷
(3)(-3)2×[-
|
(1)(-18)-(-5)+(-2)-(+15)
=-18+5-2-15
=-35+5
=-30;
(2)-2.5÷
×(-5 8
)1 4
=
×5 2
×8 5 1 4
=1;
(3)(-3)2×[-
+(-2 3
]5 9)
=9×[-
]11 9
=-11.