题目内容
计算:
(1)(-7.6)×0.5;
(2)(-3
)×(-2
);
(3)8×(-
)×(-4);
(4)21×(-71)×0×43;
(5)(-1
)×(-1
)×(-1
)×(-1
)-(-1
)×(-1
);
(6)(1-
)×(1+
)×(1-
)×(1+
)×(1-
)×(1+
).
(1)(-7.6)×0.5;
(2)(-3
| 1 |
| 2 |
| 1 |
| 3 |
(3)8×(-
| 3 |
| 4 |
(4)21×(-71)×0×43;
(5)(-1
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 5 |
| 1 |
| 6 |
| 1 |
| 7 |
(6)(1-
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 4 |
(1)(-7.6)×0.5=-3.8;
(2)(-3
)×(-2
),
=
×
,
=
;
(3)8×(-
)×(-4),
=8×
×4,
=24;
(4)21×(-71)×0×43=0;
(5)(-1
)×(-1
)×(-1
)×(-1
)-(-1
)×(-1
),
=
×
×
×
×
×
,
=4;
(6)(1-
)×(1+
)×(1-
)×(1+
)×(1-
)×(1+
),
=
×
×
×
×
×
,
=
.
(2)(-3
| 1 |
| 2 |
| 1 |
| 3 |
=
| 7 |
| 2 |
| 7 |
| 3 |
=
| 49 |
| 6 |
(3)8×(-
| 3 |
| 4 |
=8×
| 3 |
| 4 |
=24;
(4)21×(-71)×0×43=0;
(5)(-1
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 5 |
| 1 |
| 6 |
| 1 |
| 7 |
=
| 3 |
| 2 |
| 4 |
| 3 |
| 5 |
| 4 |
| 6 |
| 5 |
| 7 |
| 6 |
| 8 |
| 7 |
=4;
(6)(1-
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 4 |
=
| 1 |
| 2 |
| 3 |
| 2 |
| 2 |
| 3 |
| 4 |
| 3 |
| 3 |
| 4 |
| 5 |
| 4 |
=
| 5 |
| 8 |
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