问题
解答题
计算下列各题 (1)-13-(1+0.5)×(-
(2)(+
(3)(
(4)(-3)2÷
|
答案
(1)-13-(1+0.5)×(-
)1 3
=-1-(1.5)×(-
)1 3
=-1+1.5×1 3
=-1+0.5
=-0.5;
(2)(+
)-(+5)+(-1 2
)-(+1 3
)+(+51 4
)2 3
=
+(-5)+(-1 2
)+(-1 3
)+51 4 2 3
=6
+(-51 6
)7 12
=
;7 12
(3)(
-7 4
-7 8
)÷(-7 12
)+(-7 8
)8 3
=(
-7 4
-7 8
)×(-7 12
)+(-8 7
)8 3
=-2+1+
+(-2 3
)8 3
=-2+1-2
=-3;
(4)(-3)2÷
×(-9 4
)2÷4-22×(-2 3
)21 3
=9×
×4 9
×4 9
-4×1 4 1 9
=
-4 9 4 9
=0.