问题 解答题
计算:
(1)(-7.6)×0.5;
(2)(-3
1
2
)×(-2
1
3
);
(3)8×(-
3
4
)×(-4);
(4)21×(-71)×0×43;
(5)(-1
1
2
)×(-1
1
3
)×(-1
1
4
)×(-1
1
5
)-(-1
1
6
)×(-1
1
7
);
(6)(1-
1
2
)×(1+
1
2
)×(1-
1
3
)×(1+
1
3
)×(1-
1
4
)×(1+
1
4
).
答案

(1)(-7.6)×0.5=-3.8;

(2)(-3

1
2
)×(-2
1
3
),

=

7
2
×
7
3

=

49
6

(3)8×(-

3
4
)×(-4),

=8×

3
4
×4,

=24;

(4)21×(-71)×0×43=0;

(5)(-1

1
2
)×(-1
1
3
)×(-1
1
4
)×(-1
1
5
)-(-1
1
6
)×(-1
1
7
),

=

3
2
×
4
3
×
5
4
×
6
5
×
7
6
×
8
7

=4;

(6)(1-

1
2
)×(1+
1
2
)×(1-
1
3
)×(1+
1
3
)×(1-
1
4
)×(1+
1
4
),

=

1
2
×
3
2
×
2
3
×
4
3
×
3
4
×
5
4

=

5
8

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