问题
解答题
计算: (1)(-0.5)-(-3
(2)-19
(3){1-[
|
答案
(1)原式=-
+1 2
+13 4
-11 4
=-15 2
+2 4
+13 4
-11 4
=-2;30 4
(2)原式=-
×(-36)=718;18×19+17 18
(3)原式={1-[
-(-1 16
)×16]}÷[-1 64
-7 8
-5 8
]1 2
=[1-(
+1 16
)]÷[-1 4
-7 8
-5 8
]4 8
=[1-
]÷(-2)5 16
=
×(-11 16
)1 2
=-
.11 32