题目内容
细心算一算
(1)(+2)-(-6)
(2)|-3|×(-
)÷(-
)
(3)(
-
-
)×30
(4)18-[6-(-2)×(-
)]
(5)-21
+(+3
)-(-
)-(+
)
(6)(
-
)×(-18)-16×(
-
).
(1)(+2)-(-6)
(2)|-3|×(-
| 3 |
| 4 |
| 1 |
| 4 |
(3)(
| 1 |
| 2 |
| 5 |
| 6 |
| 3 |
| 5 |
(4)18-[6-(-2)×(-
| 1 |
| 2 |
(5)-21
| 2 |
| 3 |
| 1 |
| 4 |
| 2 |
| 3 |
| 1 |
| 4 |
(6)(
| 5 |
| 9 |
| 7 |
| 6 |
| 2 |
| 9 |
| 7 |
| 18 |
(1)(+2)-(-6)=8;
(2)|-3|×(-
)÷(-
)
=3×
×4
=9;
(3)(
-
-
)×30
=
×30-
×30-
×30
=15-25-18
=-28;
(4)18-[6-(-2)×(-
)]
=18-[6-1]
=18-5
=13;
(5)-21
+(+3
)-(-
)-(+
)
=-21
+
+3
-
=-21+3
=-18;
(6)(
-
)×(-18)-16×(
-
)
=-
×(-18)-16×(-
)
=11+2
=13
.
(2)|-3|×(-
| 3 |
| 4 |
| 1 |
| 4 |
=3×
| 3 |
| 4 |
=9;
(3)(
| 1 |
| 2 |
| 5 |
| 6 |
| 3 |
| 5 |
=
| 1 |
| 2 |
| 5 |
| 6 |
| 3 |
| 5 |
=15-25-18
=-28;
(4)18-[6-(-2)×(-
| 1 |
| 2 |
=18-[6-1]
=18-5
=13;
(5)-21
| 2 |
| 3 |
| 1 |
| 4 |
| 2 |
| 3 |
| 1 |
| 4 |
=-21
| 2 |
| 3 |
| 2 |
| 3 |
| 1 |
| 4 |
| 1 |
| 4 |
=-21+3
=-18;
(6)(
| 5 |
| 9 |
| 7 |
| 6 |
| 2 |
| 9 |
| 7 |
| 18 |
=-
| 11 |
| 18 |
| 1 |
| 6 |
=11+2
| 2 |
| 3 |
=13
| 2 |
| 3 |
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