八年级数学计算题。急!
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假期数学100题
(一)因式分解:
⒈ 3(x-a)-x(a-x) ⒉x2-x
⒊ 4-12(a-b)+9(b-a)2 ⒋3a3x-4b3y-4a3y+3b3x
⒌1-x2+4xy-4y2
(6) x(x+y+z)+yz (7) x2m+xm+
(8) a2b2-a2-b2-4ab+1 (9) a2(x-y)2-2a(x-y)3+(x-y)4
(10) 3a8-48b8 (11) x2+4y2+9z2-4xy-6xz+12yz
12)-6ax3y+8x2y2-2x2y (13)3a2(x-y)3-4b2(y-x)2
(14)(x+y)(m-a)-3y(a-m)2+(a-m)3 (15)8x(a-1)-4(1-a)
(16)m(1-a)+mn(1-a)+1-a (17). 3ab-9ac+12ad
(18). 25p3q3+15p2q3-5q3 (19). 0.81x2y2-1
(20). 16a2b4-9a2c2 (21). 3a(m+n)-6(m+n)
(22). (m-3n)(3m+4n)+(2m-6n)(m+3n) (23). m2(a-x)+n2(x-a)
(24). 2a2(x-y)3-2ab4(y-x)2 (25). (a+b)3+(a-b)3
(26). 9a6b3+1/3a3b6 (27).xm+3-xm
(28). am+2-am-2 (29).(a+b)n+2-(a+b)n
(30). 4a4_12a2b+9b2 (31). (a- b)2-4(a-b)c+4c2
(32). (2a-3b)2-4(2a-3b)b+4b2 (33). -x2+10x-25
(34). a2-8a-20 (35). m2+mn-20n2
(36). (a+b)2-3(a+b)-18 (37). 4x2-3x-10
(38) x2-14x+49 (39) m2-5m-6
(40) 4a2+4a+1 (41) a2+24a+144
(42) a2-5ab+4b2 (43) m2-4mn-12n2
(44) 10x2-3xy-18y2 (45) (3S-r)2+9(3s-r)+8
(46) 12x-4-9x2 (47) 1-10ab2+25a2b4
(48) (a-b)2+4(b-a)+4 (49) 2x4n÷x2n·(0.24xn)
(50)3xy·2x4+7x2y(-x3)-(-x2y)·x2 (51)(6a5-7a2+36a3)÷3a2+2a(a2+a-6)
(52)2(-xny)3·(-0.5xny2)3+0.75(x2ny3)3
53, 54 55、
56、2x2y-8xy+8y 57、a2(x-y)-4b2(x-y)
(二)计算
58 59、 x2-2xy+2y2.
60 61
62 63(a+2b-3c)(a-2b+3c)
64已知x(x-1)-(x2-y)=-2.求 的值.
65、
66[(x-2y) +(x-2y)(2y+x)-2x(2x-y)]÷2x.
67和68题.分解下列因式:
(1) . (2) .
69.先化简,再求值:
,其中x = -2。y = .
(三).计算题
(70)(-1)2+(-12)-1-5÷(3.14-π)0(4分)
(71) (4分)
(73) [(x+y)2-(x-y)2]÷(2xy) (4分)
(四)简便方法计算(74 ) 98×102-992 (4分) ( 75) (4分)
(五).因式分解:
(76) (4分) (77) (4分)
78. 已知 ,求 的值。(7分)
(79)
80 (x4-y4)÷(x2-y2; 81 ,(-2a2)3
82,(ax+by)÷(a+b) 83,6x2m÷2xm
84,am=4,an=3,am+n, 86.(2x-1)(-3x+2)
87. 88.
(六)计算,
89 , [-3(x+y)2]3 90 ,x·(x2)3-2x4·x2
91,-(x3)4·x2 (92)a3·a3 (93)b4·b4
(94)(a3)5, (95)a3·a5 (96)(a2)3·a4 (97)(xy3)2
98,
(99)计算:am-1·an+2+am+2·an-1+am·an+1
100,-(x3)4·x2
(一)因式分解:
⒈ 3(x-a)-x(a-x) ⒉x2-x
⒊ 4-12(a-b)+9(b-a)2 ⒋3a3x-4b3y-4a3y+3b3x
⒌1-x2+4xy-4y2
(6) x(x+y+z)+yz (7) x2m+xm+
(8) a2b2-a2-b2-4ab+1 (9) a2(x-y)2-2a(x-y)3+(x-y)4
(10) 3a8-48b8 (11) x2+4y2+9z2-4xy-6xz+12yz
12)-6ax3y+8x2y2-2x2y (13)3a2(x-y)3-4b2(y-x)2
(14)(x+y)(m-a)-3y(a-m)2+(a-m)3 (15)8x(a-1)-4(1-a)
(16)m(1-a)+mn(1-a)+1-a (17). 3ab-9ac+12ad
(18). 25p3q3+15p2q3-5q3 (19). 0.81x2y2-1
(20). 16a2b4-9a2c2 (21). 3a(m+n)-6(m+n)
(22). (m-3n)(3m+4n)+(2m-6n)(m+3n) (23). m2(a-x)+n2(x-a)
(24). 2a2(x-y)3-2ab4(y-x)2 (25). (a+b)3+(a-b)3
(26). 9a6b3+1/3a3b6 (27).xm+3-xm
(28). am+2-am-2 (29).(a+b)n+2-(a+b)n
(30). 4a4_12a2b+9b2 (31). (a- b)2-4(a-b)c+4c2
(32). (2a-3b)2-4(2a-3b)b+4b2 (33). -x2+10x-25
(34). a2-8a-20 (35). m2+mn-20n2
(36). (a+b)2-3(a+b)-18 (37). 4x2-3x-10
(38) x2-14x+49 (39) m2-5m-6
(40) 4a2+4a+1 (41) a2+24a+144
(42) a2-5ab+4b2 (43) m2-4mn-12n2
(44) 10x2-3xy-18y2 (45) (3S-r)2+9(3s-r)+8
(46) 12x-4-9x2 (47) 1-10ab2+25a2b4
(48) (a-b)2+4(b-a)+4 (49) 2x4n÷x2n·(0.24xn)
(50)3xy·2x4+7x2y(-x3)-(-x2y)·x2 (51)(6a5-7a2+36a3)÷3a2+2a(a2+a-6)
(52)2(-xny)3·(-0.5xny2)3+0.75(x2ny3)3
53, 54 55、
56、2x2y-8xy+8y 57、a2(x-y)-4b2(x-y)
(二)计算
58 59、 x2-2xy+2y2.
60 61
62 63(a+2b-3c)(a-2b+3c)
64已知x(x-1)-(x2-y)=-2.求 的值.
65、
66[(x-2y) +(x-2y)(2y+x)-2x(2x-y)]÷2x.
67和68题.分解下列因式:
(1) . (2) .
69.先化简,再求值:
,其中x = -2。y = .
(三).计算题
(70)(-1)2+(-12)-1-5÷(3.14-π)0(4分)
(71) (4分)
(73) [(x+y)2-(x-y)2]÷(2xy) (4分)
(四)简便方法计算(74 ) 98×102-992 (4分) ( 75) (4分)
(五).因式分解:
(76) (4分) (77) (4分)
78. 已知 ,求 的值。(7分)
(79)
80 (x4-y4)÷(x2-y2; 81 ,(-2a2)3
82,(ax+by)÷(a+b) 83,6x2m÷2xm
84,am=4,an=3,am+n, 86.(2x-1)(-3x+2)
87. 88.
(六)计算,
89 , [-3(x+y)2]3 90 ,x·(x2)3-2x4·x2
91,-(x3)4·x2 (92)a3·a3 (93)b4·b4
(94)(a3)5, (95)a3·a5 (96)(a2)3·a4 (97)(xy3)2
98,
(99)计算:am-1·an+2+am+2·an-1+am·an+1
100,-(x3)4·x2
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