题目内容
(1)15+(-
)-15-(-0.25);
(2)(-81)÷
×
÷(-32);
(3)29
×(-12);
(4)25×
-(-25)×
+25×(-
).
| 1 |
| 4 |
(2)(-81)÷
| 9 |
| 4 |
| 4 |
| 9 |
(3)29
| 23 |
| 24 |
(4)25×
| 3 |
| 4 |
| 1 |
| 2 |
| 1 |
| 4 |
(1)原式=15-0.25-15+0.25
=0;
(2)原式=-81×
×
×(-
)
=
;
(3)原式=(30-
)×(-12)
=-360+
=-359
;
(4)原式=25×(
+
-
)
=25×1
=25.
=0;
(2)原式=-81×
| 4 |
| 9 |
| 4 |
| 9 |
| 1 |
| 32 |
=
| 1 |
| 2 |
(3)原式=(30-
| 1 |
| 24 |
=-360+
| 1 |
| 2 |
=-359
| 1 |
| 2 |
(4)原式=25×(
| 3 |
| 4 |
| 1 |
| 2 |
| 1 |
| 4 |
=25×1
=25.
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