计算:(1)-2+3-(-4)+(-1);(2)34×(8?43?1415);(3)(?1)3×49÷(?23)2;(4)?22?6÷(?2)×13?
计算:(1)-2+3-(-4)+(-1);(2)34×(8?43?1415);(3)(?1)3×49÷(?23)2;(4)?22?6÷(?2)×13?|?9+5|....
计算:(1)-2+3-(-4)+(-1);(2)34×(8?43?1415);(3)(?1)3×49÷(?23)2;(4)?22?6÷(?2)×13?|?9+5|.
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(1)-2+3-(-4)+(-1),
=(-2)+(+3)+(+4)+(-1),
=[(-2)+(+3)]+[(+4)+(-1)],
=1+3,
=4;
(2)
×(8?
?
),
=
×8?
×
?
×
,
=6-1-
,
=4.3;
(3)(?1)3×
÷(?
)2,
=?1×
÷
,
=-1;
(4)?22?6÷(?2)×
?|?9+5|,
=?4?6×(?
)×
?4,
=-4+1-4,
=-7.
=(-2)+(+3)+(+4)+(-1),
=[(-2)+(+3)]+[(+4)+(-1)],
=1+3,
=4;
(2)
3 |
4 |
4 |
3 |
14 |
15 |
=
3 |
4 |
3 |
4 |
4 |
3 |
3 |
4 |
14 |
15 |
=6-1-
7 |
10 |
=4.3;
(3)(?1)3×
4 |
9 |
2 |
3 |
=?1×
4 |
9 |
4 |
9 |
=-1;
(4)?22?6÷(?2)×
1 |
3 |
=?4?6×(?
1 |
2 |
1 |
3 |
=-4+1-4,
=-7.
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