题目内容
计算:
(1)
+
-
;
(2)2
+(-1)3-2×
-(
-2)0;
(3)3ab(2a2b-ab2);
(4)(3a-b)(-b+4a);
(5)(-2x+y)2+4y(x-
y);
(6)(-2a+b)(-2a-b)+2a(-3a+
ab).
(1)
4 |
(-4)2 |
3 | -27 |
(2)2
2 |
| ||
2 |
3 |
(3)3ab(2a2b-ab2);
(4)(3a-b)(-b+4a);
(5)(-2x+y)2+4y(x-
1 |
2 |
(6)(-2a+b)(-2a-b)+2a(-3a+
1 |
2 |
(1)
+
-
;
=2+4-(-3)
=9;
(2)2
+(-1)3-2×
-(
-2)0
=2
-1-
-1
=
-2;
(3)3ab(2a2b-ab2)
=6a3b2-3a2b3;
(4)(3a-b)(-b+4a)
=-3ab+12a2+b2-4ab
=12a2-7ab+b2;
(5)(-2x+y)2+4y(x-
y)
=4x2-4xy+y2+4xy-2y2
=4x2-y2;
(6)(-2a+b)(-2a-b)+2a(-3a+
ab)
=4a2-b2-6a2+a2b
=-2a2-b2+a2b.
4 |
(-4)2 |
3 | -27 |
=2+4-(-3)
=9;
(2)2
2 |
| ||
2 |
3 |
=2
2 |
2 |
=
2 |
(3)3ab(2a2b-ab2)
=6a3b2-3a2b3;
(4)(3a-b)(-b+4a)
=-3ab+12a2+b2-4ab
=12a2-7ab+b2;
(5)(-2x+y)2+4y(x-
1 |
2 |
=4x2-4xy+y2+4xy-2y2
=4x2-y2;
(6)(-2a+b)(-2a-b)+2a(-3a+
1 |
2 |
=4a2-b2-6a2+a2b
=-2a2-b2+a2b.
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