题目内容
细心算一算.
(1)|-2.7|+(-3.5);
(2)
×(-7.2)÷(-2
);
(3)(
)2×(-1.5) -
÷(-1.52);
(4)-59
×32.
(1)|-2.7|+(-3.5);
(2)
| 1 |
| 9 |
| 2 |
| 5 |
(3)(
| 2 |
| 3 |
| 2 |
| 3 |
(4)-59
| 15 |
| 16 |
(1)|-2.7|+(-3.5)
=2.7-3.5
=-(3.5-2.7)
=-0.8;
(2)
×(-7.2)÷(-2
)
=(-
)×(-
)
=
;
(3)原式=
×(-
)-
×(-
)
=-
+
=-(
-
)
=-
;
(4)-59
×32
=(
-60)×32
=
×32-60×32
=2-1920
=-
=-1918.
=2.7-3.5
=-(3.5-2.7)
=-0.8;
(2)
| 1 |
| 9 |
| 2 |
| 5 |
=(-
| 4 |
| 5 |
| 5 |
| 12 |
=
| 1 |
| 3 |
(3)原式=
| 4 |
| 9 |
| 3 |
| 2 |
| 2 |
| 3 |
| 4 |
| 9 |
=-
| 2 |
| 3 |
| 8 |
| 27 |
=-(
| 2 |
| 3 |
| 8 |
| 27 |
=-
| 10 |
| 27 |
(4)-59
| 15 |
| 16 |
=(
| 1 |
| 16 |
=
| 1 |
| 16 |
=2-1920
=-
=-1918.
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