初三化简求值题及过程
@祁砌4859：求10道初三分式化简求值求值题+答案. - 作业帮
鲁毕13211647632…… [答案] 例1、化简 (08宁波市) 例2、化简: (08泸州市) = = = = = . 2、乘除型化简 例3、化简: (08年大连市改编) 分析:在解答化简问题时,我们要做到如下几点: 1、当分子、分母是多项式时,先进行分解因式; 2、进行通分; 3、进行约分,化...
@祁砌4859：初三题目,只要中间那题化简求值的过程和答案! -
鲁毕13211647632…… 原式=x²-4+x³-x²=x³-4 当x=-1时, 原式=(-1)³-4=-1-4=-5
@祁砌4859：初三化简求值.已知x=根号24 - 1,求x^2+2x - 5的值.我想要知道全部的过程.. 谢谢,! - 作业帮
鲁毕13211647632…… [答案] x^2+2x-5=x^2+2x+1-5-1 =(x+1)^2-6 =(√24+1-1)^2-6 =24-6=18
@祁砌4859：初中数学题,化简求值 -
鲁毕13211647632…… 解答 第一题:﹙x+1﹚﹙2x-1﹚-﹙x-3﹚² =2x²-x+2x-1-(x²-6x+9) =2x²-x+2x-1-x²+6x-9 =x²+7x-10 将x=﹣2代入可得 原式=-20 第二题:[1-1/﹙m+2﹚]÷[﹙m²+2m+1﹚/﹙m²-4﹚] =(m+1)/﹙m+2﹚÷(m+1)²/(m+2)(m-2) =(m+1)(m+2)(m-2)/﹙m+2﹚(m+1)² =(m-2)/(m+1) 将m=1代入,可得原内式=-1/2 不明白可以追问.容祝你学习进步,万事如意
@祁砌4859：求初中数学300道计算题(主要是化简求值,解方程(2元1次,分式,1元1次)化简,计算)并附过程答案. -
鲁毕13211647632…… (1)简化分数(X ^ 2-1 / X ^ 2 +2 X +1) - (X +1 / X-1) =(x +1)(X-1)/(X +1)^ 2 - (X +1)/(X-1) =(x-1)/(X +1) - (X +1)/(X-1) = [(x-1)^ 2 - (X +1)^ 2] /(X +1)(X-1) =-4X /(X +1)(X-1) (2)解方程(X-1 / X) - (x/x-1)= 5/2(过程) (x-1)^ 2-X ^ 2 = 5/2x(X-1) -2X +1 = ...
@祁砌4859：初三数学中考化简求值专项训练题 -
鲁毕13211647632…… 1.(3X+2Y)+(4X+3Y)其中X=5,Y+3 原式=3X+2Y+4X+3Y=7X+5Y 当X=5,Y=3时 原式=5*7+(-3)*5+20 2.(5a^2-3b^2)+(a^2+b^2)-(5a^2+3b^2),其中a=-1,b=1 =5a^2-3b^2+a^2+b^2-5a^2-3b^2 =a^2-5b^2 =(-1)^2-5*1^2 =1-5 =-4 3.2(a^2b+ab^2)-2(a^...
@祁砌4859：一道初三的化简求值题目,求大神解答.重赏~~~ -
鲁毕13211647632…… 原式=[(3x+4)/(x²-1)-2(x+1)/(x²-1)]+(x+2)/(x-1)² =(3x+4-2x-2)/(x²-1)+(x+2)/(x-1)² =(x+2)/(x²-1)+(x+2)/(x-1)² =(x+2)(x-1)/(x+1)(x-1)²+(x+2)(x+1)/(x+1)(x-1)² =(x+2)(x-1+x+1)/(x+1)(x-1)² =2x(x+2)/(x+1)(x-1)² x+4>0,得:x>-4 2x+...
@祁砌4859：化简后求值:3(a - b) - (3a - 4b)+2(a - 5b),其中a=10,b=5.(要求写过程) - 作业帮
鲁毕13211647632…… [答案] 3(a-b)-(3a-4b)+2(a-5b) =3a-3b-3a+4b+2a-10b =2a-9b =2*10-9*5 =-25
@祁砌4859：初中数学化简求值2010中考题. -
鲁毕13211647632…… 1 x²(3-x)+x(x²-2x)+1=x²(3-x)+x²(x-2)+1=x²(3-x+x-2)+1=x²+1=3+1=4 2 (a-2)/(a+4)+1/(a+2)=(a+4-6)/(a+4)+1/(a+2)=1-6/(a+4)+1/(a+2)=1-(6a+12)/(a+4)+(a+4)/(a+2)=1+(a²-4)/((a+2)(a+4))=1+(a-2)/(a+4)=8/7 希望对你有帮助
@祁砌4859：初三数学化简求值题目,~ -
鲁毕13211647632…… [2/(x+1)+4/(x²-1)]÷x/(x-1) =[(2/(x+1)+4/(x-1)(x+1)]÷x/(x-1) =[2(x-1)/(x+1)(x-1)+4/(x-1)(x+1)]÷x/(x-1) =[2(x-1)+4/(x-1)(x+1)]÷x/(x-1) =[2(x+1)/(x-1)(x+1)]÷x/(x-1) =[2/(x-1)]÷x/(x-1) =[2/(x-1)]*(x-1)/x =2/x 当x=2时 上式=1
鲁毕13211647632…… [答案] 例1、化简 (08宁波市) 例2、化简: (08泸州市) = = = = = . 2、乘除型化简 例3、化简: (08年大连市改编) 分析:在解答化简问题时,我们要做到如下几点: 1、当分子、分母是多项式时,先进行分解因式; 2、进行通分; 3、进行约分,化...
@祁砌4859：初三题目,只要中间那题化简求值的过程和答案! -
鲁毕13211647632…… 原式=x²-4+x³-x²=x³-4 当x=-1时, 原式=(-1)³-4=-1-4=-5
@祁砌4859：初三化简求值.已知x=根号24 - 1,求x^2+2x - 5的值.我想要知道全部的过程.. 谢谢,! - 作业帮
鲁毕13211647632…… [答案] x^2+2x-5=x^2+2x+1-5-1 =(x+1)^2-6 =(√24+1-1)^2-6 =24-6=18
@祁砌4859：初中数学题,化简求值 -
鲁毕13211647632…… 解答 第一题:﹙x+1﹚﹙2x-1﹚-﹙x-3﹚² =2x²-x+2x-1-(x²-6x+9) =2x²-x+2x-1-x²+6x-9 =x²+7x-10 将x=﹣2代入可得 原式=-20 第二题:[1-1/﹙m+2﹚]÷[﹙m²+2m+1﹚/﹙m²-4﹚] =(m+1)/﹙m+2﹚÷(m+1)²/(m+2)(m-2) =(m+1)(m+2)(m-2)/﹙m+2﹚(m+1)² =(m-2)/(m+1) 将m=1代入,可得原内式=-1/2 不明白可以追问.容祝你学习进步,万事如意
@祁砌4859：求初中数学300道计算题(主要是化简求值,解方程(2元1次,分式,1元1次)化简,计算)并附过程答案. -
鲁毕13211647632…… (1)简化分数(X ^ 2-1 / X ^ 2 +2 X +1) - (X +1 / X-1) =(x +1)(X-1)/(X +1)^ 2 - (X +1)/(X-1) =(x-1)/(X +1) - (X +1)/(X-1) = [(x-1)^ 2 - (X +1)^ 2] /(X +1)(X-1) =-4X /(X +1)(X-1) (2)解方程(X-1 / X) - (x/x-1)= 5/2(过程) (x-1)^ 2-X ^ 2 = 5/2x(X-1) -2X +1 = ...
@祁砌4859：初三数学中考化简求值专项训练题 -
鲁毕13211647632…… 1.(3X+2Y)+(4X+3Y)其中X=5,Y+3 原式=3X+2Y+4X+3Y=7X+5Y 当X=5,Y=3时 原式=5*7+(-3)*5+20 2.(5a^2-3b^2)+(a^2+b^2)-(5a^2+3b^2),其中a=-1,b=1 =5a^2-3b^2+a^2+b^2-5a^2-3b^2 =a^2-5b^2 =(-1)^2-5*1^2 =1-5 =-4 3.2(a^2b+ab^2)-2(a^...
@祁砌4859：一道初三的化简求值题目,求大神解答.重赏~~~ -
鲁毕13211647632…… 原式=[(3x+4)/(x²-1)-2(x+1)/(x²-1)]+(x+2)/(x-1)² =(3x+4-2x-2)/(x²-1)+(x+2)/(x-1)² =(x+2)/(x²-1)+(x+2)/(x-1)² =(x+2)(x-1)/(x+1)(x-1)²+(x+2)(x+1)/(x+1)(x-1)² =(x+2)(x-1+x+1)/(x+1)(x-1)² =2x(x+2)/(x+1)(x-1)² x+4>0,得:x>-4 2x+...
@祁砌4859：化简后求值:3(a - b) - (3a - 4b)+2(a - 5b),其中a=10,b=5.(要求写过程) - 作业帮
鲁毕13211647632…… [答案] 3(a-b)-(3a-4b)+2(a-5b) =3a-3b-3a+4b+2a-10b =2a-9b =2*10-9*5 =-25
@祁砌4859：初中数学化简求值2010中考题. -
鲁毕13211647632…… 1 x²(3-x)+x(x²-2x)+1=x²(3-x)+x²(x-2)+1=x²(3-x+x-2)+1=x²+1=3+1=4 2 (a-2)/(a+4)+1/(a+2)=(a+4-6)/(a+4)+1/(a+2)=1-6/(a+4)+1/(a+2)=1-(6a+12)/(a+4)+(a+4)/(a+2)=1+(a²-4)/((a+2)(a+4))=1+(a-2)/(a+4)=8/7 希望对你有帮助
@祁砌4859：初三数学化简求值题目,~ -
鲁毕13211647632…… [2/(x+1)+4/(x²-1)]÷x/(x-1) =[(2/(x+1)+4/(x-1)(x+1)]÷x/(x-1) =[2(x-1)/(x+1)(x-1)+4/(x-1)(x+1)]÷x/(x-1) =[2(x-1)+4/(x-1)(x+1)]÷x/(x-1) =[2(x+1)/(x-1)(x+1)]÷x/(x-1) =[2/(x-1)]÷x/(x-1) =[2/(x-1)]*(x-1)/x =2/x 当x=2时 上式=1
