数学初二上学期计算题精选.doc

(X-2y)2(2y-x)-1+xn+1xn-2+(-x)3(-x)2n-+1=125求(x-2)2001+=3求2x+.(m-n)2(n-m)3(n-m)46.(y-x)3(x-y)5+(x-y)6(y-x)27,(a+b)9(-a-b)4+(a+b)6(a-b)+1=x31求a的值。 =4,2n=16求2m+..12。(-8)(X2)3X3-(2X3)3+(5X)2X714.–aa5–(a2)3–(-2a3)(a4)2(a3)3-(-a)(a8)2+(-3a2)2(-a4)3(-a)16.(-2a)6-(-3a3)2-[-(2a)2]=4bbn求m18已知4483=2x求x192a27b37c=1998,a,b,c是自然数求(a-b-c)2002的值20。(.9n)2==222求n值22.[(x+y)2]3{(x+y)3}4-2[(x+y)3]。若a=255,b=344c=433比较a,b,。-6a2b(x-y)3ab2(y-x)227(-7xmym)2(-xy)3-[4x2m(-x)3y2my328.(-2an+1bn)2(-3anb)2(-a2c)[(x+2y)3]5[-(x+2y)2](a+b)2[2(-a-b)3]+[2(a+b)]3(-a-b)231(2103)(25102)2(-21010)=3,2b=6,2c=12求证2b=a+..(1a2b-3a3b2+1)()[3yn-1-2xyn+1+(-1)888].35.(3a2b-2ab2-4b3)(-4a2b)(xn+1-xn+xn-1-1)..4(x-y+z)-2(x+y-z)-3(-x-y-z)38.(-5xy)2(-xy)3+(4x2y-3x)(-x3y4)+-2(x+2)-3[x-2(3-5x)+7]40..2x2(x2+3xy-y2)-xy(6x2-4y2)+y2(2x2-4xy+y2)+x-1=3,a+b+c=5,a(x2+x+1)+b(x2+x+1)+c((x2+x+1)的值42.(a-b+c)(-a+b+c)43.(-7+a+b)(-7-a-b)44.(-3x+4)(-3x-4)(x-2)(x+5)-(2x-3)(2x+1)=546.(3x-2)(2x-3)(6x+5)(x+1)(x+1)+(-2x)2+1x(3x+4)+3x24810-4(x2+x-3)2(-2x2+x-1)49(1+)(1+2)(1+4)(1+8)+1550。-2000252。(4+1)(42+1)+1(利用乘方公式)544x(x-1)2+x(2x+5)(5-2x)55(4y+3x-5z)(3x-4y+5z)56(x-1)(x4+1)(x2+1)(x+1)(3a+1)(1-3a)+(a-2)(2+a)58.(2-y)(y+2x)-(2y+x)(2y-x)594x(x2-2x-1)+x(2x+5)(5-2x)-(2x+3)(x-3)+2(x=1)(x-1)-(3x-1)(1+3x).(a+1)(a2+1)(a4+1)…..(a2000+1)62.(1-2)(1-2)(1-2)…(1-2)(1-2)63(a+b)2(a-b)2-(2a+b2(2a-b)264.(a+b+c)(a-b)(a+b)2-2ab(a2-b2)-6768(3a2+b)(3a2b)(9a4-b2).[(x-y)2+(x+y)2](x2-2y2)70.(a+1)(a+3)(a+5)(a+7)71.(a+3b)2-2(a+3b)(a-3b)+(a-3b)272.(y+3)2-3y2+2(y-1)2=.(2x-5)2+(3x+1)213(x+1)(x-1)-=3求a2++a2+b2+1=4ab求a,b值76.(3x-2y+)+b2+c2-ab-bc-ca=0求证a=