问题
解答题
计算: (1)(
(2)
(3)-14-{(-3)2-[3+0.4×(-1
|
答案
(1)(
-5 12
-7 9
)÷(-2 3
)1 36
=(
-5 12
-7 9
)×(-36)2 3
=
×(-36)-5 12
×(-36)-7 9
×(-36)2 3
=-15+28+24
=-15+52
=37;
(2)
÷[-5 6
×(-18 21
)-0.25]×(-23 4
)2 5
=
÷[-5 6
×(-8 21
)-7 4
]×(-1 4
)12 5
=
÷(5 6
-2 3
)×(-1 4
)12 5
=
×5 6
×(-12 5
)12 5
=-
;24 5
(3)-14-{(-3)2-[3+0.4×(-1
)]÷(-2)3}1 2
=-1-{9-[3+
×(-2 5
)]÷(-8)}3 2
=-1-[9-(3-
)×(-3 5
)]1 8
=-1-[9-
×(-12 5
)]1 8
=-1-(9+
)3 10
=(-1)+(-9
)3 10
=-10
.3 10