初二分式通分计算题
答:这么写?初二数学,分式运算 通分: 原式=[a^2-(a-2)(a+2)]/(a-2) =[a^2-a^2+4]/(a-2) =4/(a-2).初二数学分式运算 2s÷(s/v1+s/v2)=2÷(1/v1+1/v2)=v1v2/(v1+v2)初二数学下册分式运算题 1.2/2x-1=4/4x²-1 1/2x-1=2/(2x-1)(...
答:(2)x^2(y+1)/xy(x-1)(y+1) y^2(x-1)/xy(x-1)(y+1)
答:回答:x(x-1)2(x+1)2
答:a²-3a=a(a-3), a²-9=(a+3)(a-3)所以通分分母是a(a+3)(a-3)2x-2=2(x-1),(x-1)²=(x-1)(x-1)所以通分分母是2(x-1)(x-1)若有疑问可以百度Hi聊、
答:b³c;2:a/2xy=3ax/6x²y;b/3x²=2y/6x²y;3: 3c/2ab²=12c³/8ab²c²;-a/8bc²=-a²c/8ab²c²;4:1/(y-1)=(y+1)/(y²-1)1/(y+1)=(y-1)/(y²-1)...
答:第一题:设所求为X,则1500/x是规定时间,1600/2x是提高后时间 1500/x-1500/2x=5 第二题:原式为(2-x/x-3)-(1/x-3)=1 移项通分2-x-1=x-3 x=2 第三题:等式两侧同乘(2x+5)(5x-2)2x(5x-2)+5(2x+5)=(2x+5)(5x-2)打开括号 合并同类项 得15x=35 x=7/3 第四题:...
答:通分:=2(m+n)/(m-n)(m+n) + 2(m-n)/(m+n)(m-n)=[2(m+n)+2(m-n)]/(m^2 - n^2)=(2m+2n+2m-2n)/(m^2 - n^2)=4m/(m^2 - n^2)
答:以下是异分母分数加减法20道题目。异分母的分数加减时,先通分,通分后的异分母分数就按照同分母分数加减法的计算方法来算。通分方法:1、求出原来几个分数的分母的最小公倍数;2、根据分数的基本性质,把原来分数化成以这个最小公倍数为分母的分数;...
答:通分的计算过程先求分母最简公分母,再分数化成以最简公分母为分母的分数。1、先求出原来几个分数(式)的分母的最简公分母;2、根据分数(式)的基本性质,把原来分数(式)化成以最简公分母为分母的分数(式)。比较:7/9和8/11的大小。解:1、9和11的最简公分母为9×11= 99。2、7/9 =...
答:分式方程要检验 经检验 x=7/11是方程的解 1/(x+2) + 1/(x+7) = 1/(x+3) + 1/(x+6)通分 (x+7+x+2)/(x+2)(x+7)=(x+6+x+3)/(x+3)(x+6)(2x+9)/(x^2-9x+14)-(2x+9)/(x^2+9x+18)=0 (2x+9)[1/(x^2-9x+14)-1/(x^2+9x+18)]=0 因为x^2-9x...
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初二数学分式通分题 -
4519汤巩
: (1)x-y/2x+2y=(x-y)/2(x+y)=(x-y)(x+y)/2(x+y)^2 xy/(x+y)^2=2xy/2(x+y)^2(2)6c/a²b=18bc/3a^2b^2 c/3ab²=ac/3a^2b^2(3)x-y/2x+2y=(x-y)/2(x+y)=(x-y)(x+y)/2(x+y)^2 xy/(x+y)^2=2xy/2(x+y)^2(4)2mn/4m²-9=2mn/(2m+3)(2m-3) 2m-3/2m+3=(2m-3)^2/(2m+3)(2m-3)
空烟17382242471:
急求!初二两道通分分式计算题 -
4519汤巩
: a²-3a=a(a-3), a²-9=(a+3)(a-3) 所以通分分母是a(a+3)(a-3)2x-2=2(x-1),(x-1)²=(x-1)(x-1) 所以通分分母是2(x-1)(x-1) 若有疑问可以百度Hi聊、
空烟17382242471:
初二的几道分式通分1.2ab分之3c,3ac^2分之b,4b^2c分之22.2x+2分之x+2,x^2 - x - 2分之x,8 - 4x分之33.5b^2c分之4a,10a^2b分之3c, - 2ac^2分之5b4.a^2+2a+1分之... -
4519汤巩
:[答案] 1.2ab分之3c=3c/2ab=9bc^3/6ab^2c^2 3ac^2分之b=b/3ac^2=2b^3/6ab^2c^2 4b^2c分之2=1/2b^2c=3ac/6ab^2c^2 2.2x+2分之x+2=(x+2)/2(x+1)=2(x+2)(x-2)/4(x+1)(x-2) x^2-x-2分之x=x/(x+1)(x-2)=4x/4(x+1)(x-2) 8-4x分之3=-3/4(x-2)=-3(x+2)/4(x+1)(x-2) 3.5b...
空烟17382242471:
初二数学分式通分题
4519汤巩
: 1)12/m²-9 2/m 3 =12/m²-9 2(m-3)/(m 3)(m-3) =(12 2m-6)/m²-9 =2(m 3)/(m 3)(m-3) =2/(m-3) 2)1/(a b) ÷(1/a 1/b) =1/(a b)÷(a b)/ab =ab/(a b)² 3)( a²-4/ a²-4a 4 -1/a-2 ) ÷ a² a/a-2 =( (a 2)(a-2)/ (a-2)² -1/a-2 ) ÷ a(a 1)/a-2 =((a 2-1)/a-2) ÷ a(a 1)/a-2 =a 1/(a-2)*(a-2)/a(a 1) =a 望采纳
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一道初二分式通分题,急!在线等 -
4519汤巩
: 像5和7为分母的通分时各乘对方一样 N/M上下同时乘M+P,得 N(M+P)/M(M+P) (2N+Q)/(M+P)同时乘M,得 (2N+Q)M/M(M+P) 最后得(3NM+NP+QM)/(M²+MP)
空烟17382242471:
谁有初二数学通分题目!急!好的+10分 -
4519汤巩
:[答案] 分式练习题 1.与的______相同,称为______分数,+=______,法则是________________;与 的______相同,称为_______分式,±=_______.法则是:____________. 2.与的______不同,称为______分数,+=______,运算方法为____...
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初2分式计算题40道、最好有答案、简单点 -
4519汤巩
: 分太少,加分,不然也只有这几道(/是分数线) 分式:1、当1/x-1/y=5时,求分式(3x+5xy-3y)÷(x-3xy-y)的值.答案:5/42、已知a+b+c=0,求a(1/b+1/c)+b(1/c+1/a)+c(1/a+1/b)的值.答案:-33、解方程:(x-8)/(x-3)-(x-9)/(x-4)=(x+7)/(x+8)-(x...
空烟17382242471:
初二数学分式的通分问题!!追加【【20分!!】】 -
4519汤巩
: (1) 1/a+1=(A-1)/(A方-1) 3/1-a=-(3A+3)/(A方-1) 5/a^2-1(2) a/a-b=[A(A+B)(A+B方]/[(A方-B方)(A+B方)] b/a^2-b^2=B(A+B方)/[(A方-B方)(A+B方)] c/a+b^2 =C(A方-B方)/[(A方-B方)(A+B方)](3) a/a^2-4=A(A-2)/[(A+2)(A-2)方] a-1/a-2=(A-1)(A方-4)/[(A+2)(A-2)方] a+2/a^2-4a+4 =(A+2)方/[(A+2)(A-2)方]
空烟17382242471:
急求初二的分式运算计算题50道,应用题不要,只要计算题,要带答案! -
4519汤巩
:[答案] 2 a+1-a+3 a2-4a-5÷a2-9 a2-3a-10.解 原式=[x+2 x(x-2)-x-1(x-2)2]•x 4-x (括号内分式的分母中的多项式式分解因式.分式的除法法则) =[(x+2)(x-2)x(x-2)2-x(x-1)x(x-2)2]•x4-x(异分母...
空烟17382242471:
初二分式通分题,急!谢 -
4519汤巩
: X²(X-Y)/X(X-Y)(X+Y) (X+Y)²/X(X-Y)(X+Y)3X+2Y/2(3X-2Y) 4/(3X-2Y)(3X+2Y) X+Z/(x+y)(y+z)(X+Z) X+Y/(x+y)(y+z)(X+Z) b²(1-X)/ab(x+1)(2-x)(1-X) -a²(X+1)/ab(x+1)(2-x)(1-X) 希望回答对你有帮助哦~~ 呵呵~~