计算下列各题:(1)(-4x-3y2)(3y2-4x);(2)(3a2+12b)(3a2-12b)(9a4-14b2)(3)a(a-b)2-2b(a-b)(a+

计算下列各题:(1)(-4x-3y2)(3y2-4x);(2)(3a2+12b)(3a2-12b)(9a4-14b2)(3)a(a-b)2-2b(a-b)(a+

题型:解答题难度:一般来源:不详
计算下列各题:
(1)(-4x-3y2)(3y2-4x);
(2)(3a2+
1
2
b)(3a2-
1
2
b)(9a4-
1
4
b2
(3)a(a-b)2-2b(a-b)(a+b);
(4)(a2-ab+b2)(a2+ab+b2
答案
(1)(-4x-3y2)(3y2-4x),
=(-4x)2-(3y22
=16x2-9y4

(2)(3a2+
1
2
b)(3a2-
1
2
b)(9a4-
1
4
b2),
=[(3a22-(
1
2
b)2](9a4-
1
4
b2),
=(9a4-
1
4
b22
=81a8-
9
2
a4b2+
1
16
b4

(3)a(a-b)2-2b(a-b)(a+b),
=a(a2-2ab+b2)-2b(a2-b2),
=a3-2a2b+ab2-2a2b+2b3
=a3-4a2b+ab2+2b3

(4)(a2-ab+b2)(a2+ab+b2),
=[(a2+b22]-(ab)2
=a4+a2b2+b4
举一反三
求下列代数式的值:
(1)(3x+2y)(3x-2y)-(x-y)2.其中x=1,y=
1
2

(2)[(xy+2)(xy-2)-2(x2y2-2)]÷xy,其中x=10,y=-
1
25
题型:解答题难度:一般| 查看答案
计算:
(1)(a2+3)(a-2)-a(a2-2a-2).
(2)(
3
5
a5b3+
9
5
a7b4-
9
2
a5b5)÷
3
4
a5b3
题型:解答题难度:一般| 查看答案
计算:
(1)(xy)2(xy)3
(2)12(a-b)5÷3(a-b)2
(3)(x4+2x3-
1
2
x2)÷(-
1
2
x)2

(4)(x+2)(x-3);
(5)(2a+3b))(2a-3b);
(6)(2a+
b
2
)2
题型:解答题难度:一般| 查看答案
先化简,再求值:(2a+1)2-(2a-1)(2a+1),其中a=
1
2
题型:解答题难度:一般| 查看答案
计算:[4(a-2)2+12(a+2)(a-2)-8(a-1)2(a-2)]÷4(a-2)=______.
题型:填空题难度:一般| 查看答案
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