题目内容
计算:
(1)2
+3
;
(2)
+
-
;
(3)
-3
+
;
(4)(
-
)×(
+
);
(5)(2
-3
)2;
(6)(
+
)÷
-2;
(7)
-
+6m
-m2
;
(8)
+
+1.
(1)2
| 12 |
| 48 |
(2)
|
| 28 |
| 700 |
(3)
| 32 |
|
|
(4)(
| 6 |
| 5 |
| 6 |
| 5 |
(5)(2
| 3 |
| 2 |
(6)(
| 20 |
| 5 |
| 5 |
(7)
| 2 |
| 3 |
| 27m3 |
| m |
| 2 |
| 108m |
|
|
(8)
| 2 | ||
|
| ||
| 2 |
(1)原式=4
+12
=16
;
(2)原式=
+2
-10
=-
;
(3)原式=4
-
+
=
;
(4)原式=6-5=1;
(5)原式=12+18-12
=30-12
;
(6)原式=(2
+
)×
-2
=3-2=1;
(7)原式=
×3m
+
×6
-m
=2m
+3m
-m
=0;
(8)原式=
×
+
+1
=
-1+
+1
=
.
| 3 |
| 3 |
=16
| 3 |
(2)原式=
| ||
| 7 |
| 7 |
| 7 |
=-
| 55 |
| 7 |
| 7 |
(3)原式=4
| 2 |
3
| ||
| 2 |
| ||
| 4 |
=
| 11 |
| 4 |
| 2 |
(4)原式=6-5=1;
(5)原式=12+18-12
| 6 |
=30-12
| 6 |
(6)原式=(2
| 5 |
| 5 |
| 1 | ||
|
=3-2=1;
(7)原式=
| 2 |
| 3 |
| 3m |
| m |
| 2 |
| 3m |
| 3m |
=2m
| 3m |
| 3m |
| 3m |
=0;
(8)原式=
| 2 | ||
|
| ||
|
| ||
| 2 |
=
| 3 |
| ||
| 2 |
=
| 3 |
| 2 |
| 3 |
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