题目内容
计算:
(1)2(1+
)+
+4
;
(2)9
-7
+2
×3
;
(3)(7+4
)(2-
)2+(2+
)(2-
);
(4)-22×
+3
(3-2
)-
;
(5)
-x2
+6x
;
(6)2a[
-(
-b
)](b≥0).
(1)2(1+
| 2 |
| 48 |
|
(2)9
| 3x |
| 12x |
| 6 |
| 8x |
(3)(7+4
| 3 |
| 3 |
| 3 |
| 3 |
(4)-22×
| 8 |
| 2 |
| 2 |
| 1 | ||
1+
|
(5)
| 2x |
| 3 |
| 9x |
|
|
(6)2a[
| 3ab2 |
| 1 |
| 12 |
| 27ab2 |
|
(1)原式=2+2
+4
+2
=2+4
+4
;
(2)原式=9
-14
+24
=19
;
(3)原式=(7+4
)(7-4
)+4-3
=49-48+1
=2;
(4)原式=-4×2
+9
-12-(
-1)
=-8
+9
-12-
+1
=-11;
(5)原式=
×3
-x2 ×
+6x×
=2x
-
+
x
=
;
(6)原式=2a(b
-
×3b
+
)
=2ab
-
+ab
=
ab
.
| 2 |
| 3 |
| 2 |
=2+4
| 2 |
| 3 |
(2)原式=9
| 3x |
| 3x |
| 3x |
=19
| 3x |
(3)原式=(7+4
| 3 |
| 3 |
=49-48+1
=2;
(4)原式=-4×2
| 2 |
| 2 |
| 2 |
=-8
| 2 |
| 2 |
| 2 |
=-11;
(5)原式=
| 2x |
| 3 |
| x |
| 1 | ||
x
|
| ||
| 4 |
=2x
| x |
| x |
| 3 |
| 2 |
| x |
=
| 7x-2 |
| 2 |
| x |
(6)原式=2a(b
| 3a |
| 1 |
| 12 |
| 3a |
b
| ||
| 2 |
=2ab
| 3a |
ab
| ||
| 2 |
| 3a |
=
| 5 |
| 2 |
| 3a |
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