题目内容
化简下列各数:
(1)-(+2.7);
(2)-(-
);
(3)-[-(+2)];
(4)-[+(+2
)].
(1)-(+2.7);
(2)-(-
1 |
4 |
(3)-[-(+2)];
(4)-[+(+2
1 |
2 |
(1)-(+2.7)=-2.7;
(2)-(-
)=
;
(3)-[-(+2)]=2;
(4)-[+(+2
)]=-2
.
(2)-(-
1 |
4 |
1 |
4 |
(3)-[-(+2)]=2;
(4)-[+(+2
1 |
2 |
1 |
2 |
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