通分 2mn除以4m的平方-9与2m-3除以2m 3
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![通分 2mn除以4m的平方-9与2m-3除以2m 3](/uploads/image/f/7516503-63-3.jpg?t=%E9%80%9A%E5%88%86+2mn%E9%99%A4%E4%BB%A54m%E7%9A%84%E5%B9%B3%E6%96%B9-9%E4%B8%8E2m-3%E9%99%A4%E4%BB%A52m+3)
(M的平方+N的平方)除以2-MN=(m²+n²-2mn)/2=(m-n)²/2=16/2=8再问:是-MN再答:(M的平方+N的平方)除以2-MN=(M的平方+N的平方
[|16-m^2|+4×(m-2n)^2]/(m+4)^1/2=0列下来是这样.没错吧?以后发题目尽量不要用语言描述啊,歧义很多读起来也不方便.m不能等于-4.乘过去,|(16-m)^2|+4×(m-
m的立方-2m的平方n+mn的平方-4m的平方+4mn+4m=m(m^2-2mn+n^2-4m+4n+4)=m((m-n)^2-4(m-n)+4)=m(m-n-2)^2
n^2/m+m^2/n=(n^3+m^3)/mn(因为m的平方减去n的平方等于mn)=(n+m)(n^2-mn+m^2)/mn=(n+m)(n^2-m^2+n^2+m^2)/mn=(n+m)*2n^2
=(m-1)(m+1)/(m-1)(m+4)=(m+1)/(m+4)
“liljw0924”:二个数的分母分别为4m²-9和2m+34m²-9=(2m)²-3²=(2m+3)×(2m-3)它们的公分母是(2m+3)×(2m-3)通
m的平方-mn=21(1)mn-n的平方=-12(2)(1)+(2)得m^2-mn+mn-n^2=21-12m^2-n^2=9(1)-(2)得m^2-mn-(mn-n^2)=21-(-12)m^2-2
4m²-9=(2m+3)(2m-3)所以最简公分母就是4m²-9所以(2m-3)/(2m+3)=(2m-3)²/(4m²-9)
m/n=2m=2n(m平方-mn+3n平方)除以(m平方+mn+6n平方)=(4n²-2n²+3n²)/(4n²+2n²+6n²)=5n
2xy/(x+y)^2和x/(x^2-y^2)2xy/(x+y)^2=2xy(x-y)/[(x+y)^2(x-y)]x/(x^2-y^2)=x(x+y)/[(x+y)^2(x-y)](x-y)/(2x
解最简公分母2(x+y)²,∴(x-y)/(2x+2y)=(x+y)(x-y)/2(x+y)²=(x²-y²)/2(x+y)²xy/(x+y)
原式=[(2m-n)^2]/[m(2m-n)]=(2m-n)/m当m=1,n=-2时原式=[2-(-2)]÷1=4÷1=4^表示平方再问:还是你的标准一点,采纳你吧
2x+2y=2(x+y)所以公分母2(x+y)²所以(x-y)/(2x+2y)=(x-y)(x+y)/2(x+y)²=(x²-y²)/2(x+y)²x
2mn/(4m^2-9)(2m-3)/(2m+3)分子分母同时乘(2m-3)=(2m-3)(2m-3)/(2m+3)(2m-3)=(4m^2-12m+9)/(4m^-9)
(x²+xy)/(x+y)²=x(x+y)/(x+y)²=x/(x+y)2xy/(x+y)²x/(x²-y²)∵最简公分母为:(x+y)
3/(2M-N)=3(2M-N)/(2M-N)²2MN/(4M²-4MN+N²)=2MN/(2M-N)²如果不懂,请Hi我,祝学习愉快!
2mn分之4m方—9=n分之2—9=n分之(2-9n)2m—3分之2m+3=3分之(6m-2m-3)=3分之(4m-3)再问:额不好意思啊我不小心手滑打错了应该是2mn分之4m方—9与2m—3分之2m
最简公分母是2(x+y)²x-y/2x+2y=(x+y)(x-y)/2(x+y)².xy/(x+y)^2=2xy/2(x+y)².最简公分母是(m+3)(2m-3)2mn
先求分母的最小公倍数,为(a-1)*6,即左式上下同乘6,右式上下同乘(a-1)
n/(m²+2mn)=n/[m(m+2n)]m/(2n²-mn)=-m/[n(m+2n)]2mn/(m²-4n²)=2mn/[(m+2n)(m-2n)]所以n/