问题
解答题
计算: (1)0.47-4
(2)(
(3)-15-[-1-(4-20)]; (4)(
(5)16÷(-2)-(-
(6)
(7)100+16÷(-2)4-
(8)-14-[2-(1-
|
答案
(1)原式=(0.47+1.53)+(-4
-15 6
)1 6
=2-6
=-4;
(2)原式=-
×30+9 10
×30-1 15
×301 6
=-27+2-5
=-30;
(3)原式=-15-[-1-(-16)]
=-15-(-1+16)
=-15-15
=-30;
(4)原式=-
×1 6
×10×4 5 10 3
=-
;40 9
(5)原式=-8+
×16-11 8
=-8+2-1
=-7;
(6)原式=1-
+1 2
-1 2
+…+1 3
-1 1999 1 2000
=1-1 2000
=
;1999 2000
(7)原式=100+16÷16-
×25-1001 5
=100+1-5-100
=-4;
(8)原式=-1-[2-(1-
×1 3
)]×[9-4]1 2
=-1-[2-(1-
)]×51 6
=-1-1
×51 6
=-1-55 6
=-6
.5 6