题目内容
计算下列各题
(1)-13-(1+0.5)×(-
);
(2)(+
)-(+5)+(-
)-(+
)+(+5
);
(3)(
-
-
)÷(-
)+(-
);
(4)(-3)2÷
×(-
)2÷4-22×(-
)2.
(1)-13-(1+0.5)×(-
| 1 |
| 3 |
(2)(+
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
| 2 |
| 3 |
(3)(
| 7 |
| 4 |
| 7 |
| 8 |
| 7 |
| 12 |
| 7 |
| 8 |
| 8 |
| 3 |
(4)(-3)2÷
| 9 |
| 4 |
| 2 |
| 3 |
| 1 |
| 3 |
(1)-13-(1+0.5)×(-
)
=-1-(1.5)×(-
)
=-1+1.5×
=-1+0.5
=-0.5;
(2)(+
)-(+5)+(-
)-(+
)+(+5
)
=
+(-5)+(-
)+(-
)+5
=6
+(-5
)
=
;
(3)(
-
-
)÷(-
)+(-
)
=(
-
-
)×(-
)+(-
)
=-2+1+
+(-
)
=-2+1-2
=-3;
(4)(-3)2÷
×(-
)2÷4-22×(-
)2
=9×
×
×
-4×
=
-
=0.
| 1 |
| 3 |
=-1-(1.5)×(-
| 1 |
| 3 |
=-1+1.5×
| 1 |
| 3 |
=-1+0.5
=-0.5;
(2)(+
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
| 2 |
| 3 |
=
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
| 2 |
| 3 |
=6
| 1 |
| 6 |
| 7 |
| 12 |
=
| 7 |
| 12 |
(3)(
| 7 |
| 4 |
| 7 |
| 8 |
| 7 |
| 12 |
| 7 |
| 8 |
| 8 |
| 3 |
=(
| 7 |
| 4 |
| 7 |
| 8 |
| 7 |
| 12 |
| 8 |
| 7 |
| 8 |
| 3 |
=-2+1+
| 2 |
| 3 |
| 8 |
| 3 |
=-2+1-2
=-3;
(4)(-3)2÷
| 9 |
| 4 |
| 2 |
| 3 |
| 1 |
| 3 |
=9×
| 4 |
| 9 |
| 4 |
| 9 |
| 1 |
| 4 |
| 1 |
| 9 |
=
| 4 |
| 9 |
| 4 |
| 9 |
=0.
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