题目内容
计算:
(1)|-2|-(-2.5)-|1-4|
(2)2×(-3)2-33-6÷(-2)
(3)[
-(
+
-
)×24]÷5
(4)29
×(-26).
(1)|-2|-(-2.5)-|1-4|
(2)2×(-3)2-33-6÷(-2)
(3)[
| 25 |
| 24 |
| 3 |
| 8 |
| 1 |
| 6 |
| 3 |
| 4 |
(4)29
| 12 |
| 13 |
(1)|-2|-(-2.5)-|1-4|
=2+2.5-3
=1.5;
(2)2×(-3)2-33-6÷(-2)
=2×9-27+3
=18-27+3
=-6;
(3)[
-(
+
-
)×24]÷5
=[
-(9+4-18)]÷5
=[
+5]÷5
=
+1
=1
;
(4)29
×(-26)
=(30-
)×(-26)
=-30×26+
×26
=-780+2
=-778.
=2+2.5-3
=1.5;
(2)2×(-3)2-33-6÷(-2)
=2×9-27+3
=18-27+3
=-6;
(3)[
| 25 |
| 24 |
| 3 |
| 8 |
| 1 |
| 6 |
| 3 |
| 4 |
=[
| 25 |
| 24 |
=[
| 25 |
| 24 |
=
| 5 |
| 24 |
=1
| 5 |
| 24 |
(4)29
| 12 |
| 13 |
=(30-
| 1 |
| 13 |
=-30×26+
| 1 |
| 13 |
=-780+2
=-778.
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