一、计算: (1)() ()x xy 243-- (2)xyz y x 16 5 5232? (3)4y (-2x y 3); (4))()(6 3103102??? (5)2322 3 )41)(21(y x y x - (6)"/>
单项式乘以单项式
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一、计算:
(1)()
()x xy 243-- (2)xyz y x 16
5
5232? (3)4y ·(-2x y 3);
(4))()(6
3103102??? (5)2322
3
)41)(21(y x y x -
(6)y x y x n n 212
3
8?+
(7))5.0)(54)(25.0(323
y x xy xy -- (8)xyz y x xy y x ))(2
1
)(2(2222---
(9)(
)
??
?
??--++211
2613y x y x
n n n 10)])2(31[)2(23232x y ab y x a ----
(1))83(4322yz x xy -? (2))3
1
2)(73(3323c b a b a -
(3))125.0(2.3322n m mn - (4))5
3
(32)21(322yz y x xyz -??-
(5))2.1()25.2()31(522y x axy ax x ?-?? (6)3322)2()5.0(5
2
xy x xy y x ?---?
(7))4
7
(123)5(232y x y x xy -?-?- (8)23223)4()()6()3(5a ab ab ab b b a -?--?-+-?
(1))83(4322
yz x xy -? (2))3
12)(73(3323c b a b a -
(3))2.1()25.2()3
1(52
2y x axy ax x ?-?? (4)3
322)2()5.0(5
2xy x xy y x ?---?
(5))4
7(123)5(2
3
2y x y x xy -
?-?- (6)23223)4()()6()3(5a ab ab ab b b a -?--?-+-?
单项式乘多项式
(1)(2xy 2-3xy)·2xy; (2)-x(2x +3x 2-2);(3)-2ab(ab -3ab 2-1);
(4)(34a n +1-b
2)·ab.
(5)-10mn ·(2m 2
n-3mn 2
). (6)(-4ax)2
·(5a 2
-3ax 2
).
(7)(3x 2y-2xy 2)·(-3x 3y 2
)2
. (8)7a(2ab 2
-3b). (9)x(x 2-1)+2x 2(x+1)-3x(2x-5).
8.(﹣a 2b )(b 2﹣
a+) (9).(﹣2a 2b )3(3b 2﹣4a+6)
10.2ab (5ab+3a 2b ) 11..
12.计算:2x (x 2﹣x+3) 13.(﹣4a 3+12a 2b ﹣7a 3b 3)(﹣4a 2)
14.计算:xy 2(3x 2y ﹣xy 2+y ) 15.(﹣2ab )(3a 2﹣2ab ﹣4b 2)
1.22
(3)(21)x x x --+-= 2.3
2
1(248)()2
x x x ---?-
=
222(1)3(1)a b ab ab ab -++-= 4.2232(3)(23)3(25)x x x x x x ---+--=
228(34)(3)m m m m m -+--= 6.7(21)3(41)2(3)1x x x x x x ----++=
7.22223(2)()a b ab a b a --+= 8.223263()(2)2(1)x x y x x y --?-+-=
(1)(-a)8
÷(-a 5
); (2)(x -y)7
÷(y -x)6
;(3)(-m 4)3
÷(-m)7
; (4)x 7
÷(x 5
÷x 3
).
21.计算:
(1)(-25a 2b 4)÷(-14ab 2)÷(-10ab); (2)-32a 4b 5c ÷(-2ab)3
·(-34
ac);
(3)(23n 3-7mn 2+23n 5)÷23
n 2; (4)(12x 4y 6-8x 2y 4-16x 3y 5)÷4x 2y 3
.
多项式与多项式相乘
一、计算
1、(x +2)(x +6)
2、(x +5)(x +6)
3、(x +5)(x -7)
4、(x+2)(x -3)
5、(-x -2)(x -6)
6、(-x -5y )(x -7y );
7、(x -3y)(x+7y)
8、(2x -y )(3x +2y );
9、(3x -1)(2x+1) 10、(2x -3)(3x -4); 11、(3x+2y )(3x -4y ) 12、(-8x+5) (5x - 4),; 13、(-4x -y )(-5x +2y ) 14、(-2a -3b )(4a -2b ) 15、(2x -3y )(4x 2+6xy +9y 2);
16、(a 2+2)(a 4-2a 2+4) 17、(3x 2+2x +1)(2x 2+3x -1)
18、(y-1)(y-2)(y-3)
19、(a-4)(a+3) -(2 a+1)(a-3)20、(x+2)(x-3)-x(x-2)21.(x-3)(x2一6x+1)-x(x2一x-3)22.(a-2b)2+(a-b)(a+b)-2(a-3b)(a-b), (1)(2x+3y)(3x-2y) (2) (3x-1)(4x+5)
(3)(x+3)(x+4)-(x-1)(x-2) (4)(3x+2y)(2x+3y)-(x-3y)(3x+4y) (5)(x+2)(x+3)-(x+6)(x-1) (1)(m+1)(2m-1); (2)(2a-3b)(3a+2b);
(3)(2x-3y)(4x2+6xy+9y2); (1)(-
1
2
ab)(
2
3
ab2-2ab+
4
3
b+1);
(2)3ab(a2b-ab2-ab)-ab2(2a2-3ab+2a). (4)
1
2
(2x-y)(x+y);
(5)a(a-3)+(2-a)(2+a).
三、因式分解
8、(1)32
1510
a a
+ (2)2
123
abc bc
-
(3)6()4()
p p q q p q
+-+ (4)(3)2(3)
m a a
-+-
(5)3x 3+6x 4; (6)4a 3b 2-10ab 3c ;
(7)-3ma 3+6ma 2-12ma ; (8)6p(p +q)-4q(p +q).
(9)x 4+x 3+x ; (10)x(x -y)+y(y -x);
(11)6x(a -b)+4y(b -a); (12)(a 2-ab)+c(a -b);
(13)4q(1-p)3+2(p -1)2.
(1)
2
2125
a b
- (2)2294a b -
(3)24x y y - (4)416a -+
(5)4x 2-y 2; (6)-16+a 2b 2;
(7)100x 2-9y 2; (8)(x +2y)2-(x -y)2;
(9)16-b 4. (10)a 3-9a ;
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