题目内容
计算:
(1)
-
+
(2)(
)3÷(
)2
(3)
•
(4)
÷(
-x-2).
(1)
2a+5 |
2(a+1) |
a-1 |
2(a+1) |
2a-3 |
2(a+1) |
(2)(
a2b |
-c2 |
-a3 |
c |
(3)
a2+5a+4 |
a2+a-6 |
a2-6a+8 |
a2-16 |
(4)
2x-6 |
x-2 |
5 |
x-2 |
(1)原式=
=
=
;
(2)原式=
×
=-
;
(3)原式=
•
=
;
(4)原式=
÷
=
•
=-
.
2a+5-a+1+2a-3 |
2(a+1) |
3(a+1) |
2(a+1) |
3 |
2 |
(2)原式=
a6b3 |
-c6 |
c2 |
a6 |
b3 |
c4 |
(3)原式=
(a+1)(a+4) |
(a-2)(a-3) |
(a-2)(a-4) |
(a+4)(a-4) |
a+1 |
a+3 |
(4)原式=
2(x-3) |
x-2 |
-(x+3)(x-2) |
x-2 |
=
2(x-3) |
x-2 |
x-2 |
-(x+3)(x-3) |
=-
2 |
x+3 |
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