计算:(1)-4-28-(-19)+(-24)+|-5-21|;(2)(23?112?115)×(?60)(3)1112?[(?5)2×(15)3?0.8]÷22
计算:(1)-4-28-(-19)+(-24)+|-5-21|;(2)(23?112?115)×(?60)(3)1112?[(?5)2×(15)3?0.8]÷225×(?...
计算:(1)-4-28-(-19)+(-24)+|-5-21|;(2)(23?112?115)×(?60)(3)1112?[(?5)2×(15)3?0.8]÷225×(?14+16)
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(1)-4-28-(-19)+(-24)+|-5-21|
=-4-28+19-24+26
=-4-28-24+19+26
=-56+45
=-11;
(2)(
?
?
)×(?60)
=-(
×60?
×60?
×60)
=-(40-5-4)
=-31;
(3)1
?[(?5)2×(
)3?0.8]÷2
×(?14+
)
=
-(0.2-0.8)×
×(?
)
=
+
×
×(?
)
=
-
=
-
=
.
=-4-28+19-24+26
=-4-28-24+19+26
=-56+45
=-11;
(2)(
2 |
3 |
1 |
12 |
1 |
15 |
=-(
2 |
3 |
1 |
12 |
1 |
15 |
=-(40-5-4)
=-31;
(3)1
1 |
12 |
1 |
5 |
2 |
5 |
1 |
6 |
=
13 |
12 |
5 |
12 |
5 |
6 |
=
13 |
12 |
3 |
5 |
5 |
12 |
5 |
6 |
=
13 |
12 |
5 |
24 |
=
26 |
24 |
5 |
24 |
=
7 |
8 |
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