题目内容
计算下列各式:
(1)-1-2+4
(2)|+3|+
+(-2)2
(3)(-3)÷
+
×(-
)
(4)7
×(1
-1
+3
)×(-2
).
(1)-1-2+4
(2)|+3|+
| 3 | -1 |
(3)(-3)÷
| 1 |
| 2 |
| 1 |
| 6 |
| 144 |
(4)7
| 1 |
| 9 |
| 1 |
| 2 |
| 1 |
| 8 |
| 1 |
| 4 |
| 1 |
| 4 |
(1)原式=-3+4
=1;
(2)原式=3-1+4
=6;
(3)原式=-3×2+
×(-12)
=-6-2
=-8;
(4)原式=
×(-
)×(1-1+3+
-
+
)
=-16×
=-10.
=1;
(2)原式=3-1+4
=6;
(3)原式=-3×2+
| 1 |
| 6 |
=-6-2
=-8;
(4)原式=
| 64 |
| 9 |
| 9 |
| 4 |
| 1 |
| 2 |
| 1 |
| 8 |
| 1 |
| 4 |
=-16×
| 5 |
| 8 |
=-10.
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