(6m^3n)·(-2mn)÷(4mn^2)
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由于:mn/(m+n)=2则有:mn=2(m+n)则:原式=(3m+3n-5mn)/(-m-n+3mn)=[3(m+n)-5mn]/[-(m+n)+3mn]=[3(m+n)-10(m
(m^2-n^2/mn)^2÷(m+n)^2*(m/m-n)^3=(m+n)^2(m-n)^2/m^2n^2÷(m+n)^2*m^3/(m-n)^3=(m-n)^2/m^2n^2*m^3/(m-n)^
3m-5mn+3n/(-m)+3mn-n=【3(m+n)-5mn】/【3mn-(m+n)】=【3-5mn/(m+n)】/【3mn/(m+n)-1】=【3-5x2】/【3x2-1】=-7/5
mn/(3m-n)=3,则:(3m-n)/(mn)=1/3,则:2mm/(3m-n)+(6m-2n)/(mn)=2[(mn)/(3m-n)]+2×[(3m-n)/(mn)]=2×3+2×(1/3)=2
(m²-6mn+9n²)÷(m-3n)-(4m²-9n²)÷(2m-3n)=(m-3n)²÷(m-3n)-(2m-3n)(2m+3n)÷(2m-3n)
(m²-6mn+9n²)÷(m-3n)-(4m²-9n²)÷(2m-3n)=(m-3n)^2÷(m-3n)-(2m+3n)(2m-3n)÷(2m-3n)=m-3
答:mn/(m+n)=2分子分母同除以mn得:1/(1/n+1/m)=21/m+1/n=1/2(3m-5mn+3n)/(-m+3mn-n)分子分母同除以mn得:=(3/n-5+3/m)/(-1/n+3
(m^2n-3n-2mn^2)·(-mn)=-m³n²+3mn²+2m²n³面积=1/2×4a^2b×(2a+3b)=2a²b(2a+3b)
3m^2-mn/9m^2-6mn+n^2=m(3m-n)/(3m-n)^2=m/(3m-n)=3n/(9n-n)=3/8
m²-mn=15==>3m²-3mn=45(1)mn-n²=-6==>2mn-2n²=-12(2)(1)式+(2)式==>3m²-mn-2n²
算术平方根大于等于0,相加等于0,若有一个大于0,则另一个小于0,不成立.所以两个都等于0所以m-n=03m-2n=0所以m=0,n=0所以原式=2m²+5mn-4n²=0+0-0
(m²-6mn+9n²)÷(m-3n)-(4m²-9n²)÷(2m-3n)=(m-3n)^2÷(m-3n)-(2m+3n)(2m-3n)÷(2m-3n)=m-3
-MN(M^2N^5-MN^3-N)=-(-6)^3+(-6)^2-(-6)=258
(mn-m²)÷(m²-2mn+n²)/mn·(m²-n²)/m²=m(n-m)×mn/(m-n)²×(m+n)(m-n)/m
=(m^2-mn)+2(m^2-n^2)=(m^2-mn)+2(m^2-mn)+2(mn-n^2)题目条件打错了,自己代入一下
2[mn+(-3m)]-3(2n-mn)=2mn-6m-6n+3mn=5mn-6m-6n=5mn-6(m+n)m+n=2mn=-3=-15-12=-27
3(m^2n+mn)-4(mn-2m^2n)+mn.=3m^2n+3mn-4mn+8m^2n+mn.=11m^2n.
【2m²n-3mn²】÷【mn】=2m-3n