通分 4m的平方-9分之2mn与2m 3分之2m-3
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3/2a^2b与(a-b)/3ab^2c的公分母为6a^2b^2c,3/2a^2b=9bc/6a^2b^2c,(a-b)/3ab^2c=2(a-b)a/6a^2b^2c
因为4x/(x²-4)=4x/(x+2)(x-2)1/(x+2)与4x/(x²-4)的最简公分母是(x+2)(x-2)1/(x+2)=(x-2)/(x+2)(x-2)4x/(x&s
m的3次方+2m的平方+m分之m-1=(m-1)/m(m²+2m+1)=(m-1)/m(m+1)²=(m-1)²/m(m+1)²(m-1)m的平方-1分之2=2
5/(-2a),2/(9a^2b^3)-45ab^3/(18a^2b^3),4/(18a^2b^3),再问:约分(3x的立方+6x的平方y)分之(x的立方-4xy的平方)再答:(x^3-4xy^2)/
1/2a^(3m-2)b^4与2/3a^(m+2)*b^(n+3)的和是单项式,则3m-2=m+2,4=n+3m=2,n=1x=mn/2=1代入2x-3=0得-1=0,不成立因此x=2分之mn不是方程
“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)
若是:①4x²-y²和②X/(3Y-6X),则公分母是3(y-6x);若是:①1/(4x²-y²)和②X/(3Y-6X),①=1/[(2x-y)(2x+y)],
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)
1/(X-Y)与2/(X^2-Y^2)分母最小公倍数为X^2-Y^2,所以第一个分式分子分母同乘X+Y
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)
3a分之2与-4ab的平方分之3通分2/3a-3/4ab^2=2ab/3ab^2-3/4ab^2=8ab/12ab^2-9/12ab^2=(8ab-9)/12ab^2
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
m^2/9+2mn/3+n^2=(1/9)(m^2+6mn+9n^2)=(1/9)(m+3n)^2a^2-14ab+49b^2=(a-7b)^216a^4+24a^2b^2+9b^4=(4a^2+3b
将分式m的2次方+2mn分之n,2n的2次方-mn分之m,m的2次方-4n的2次方分之mn通分后的结果n/(m^2+2mn)=n^2(m-2n)/[mn(m+2n)(m-2n)]m/(2n^2-mn)
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/