①.8a²b²c²÷12a²bc ②.5mn(a-b)/-15m³(b
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①.8a²b²c²÷12a²bc ②.5mn(a-b)/-15m³(b-a) ③..6-2x / 9+x²-6x ④.7a²(a+b-c) / 28ab(c-a-b)⑤..3x²-3xy / x²-2xy+y² ⑥ 4b²-a² / 4b²-4ab+a² ⑦..3x²-18x+27 / 2x²-18
![①.8a²b²c²÷12a²bc ②.5mn(a-b)/-15m³(b](/uploads/image/z/18234343-55-3.jpg?t=%E2%91%A0.8a%26sup2%3Bb%26sup2%3Bc%26sup2%3B%C3%B712a%26sup2%3Bbc+%E2%91%A1.5mn%28a-b%29%2F-15m%26sup3%3B%EF%BC%88b)
8a²b²c²÷12a²bc =2bc/3(分子分母同除4a²bc)
5mn(a-b)/-15m³(b-a) =n/3m(分子分母同除5m(a-b))
6-2x / 9+x²-6x=2(3-x)/(x-3)^2=2/(3-x)
7a²(a+b-c) / 28ab(c-a-b) =-a/4b(分子分母同除7a(a+b-c) )
3x²-3xy / x²-2xy+y²=3x(x-y)/(x-y)^2=3x/(x-y)
4b²-a² / 4b²-4ab+a²=(2b+a)(2b-a)/(2b-a)^2=(2b+a)/(2b-a)
3x²-18x+27 / 2x²-18=3(x^2-6x+9)/2(x^2-9)=3(x-3)^2/2(x+3)(x-3)=3(x-3)/2(x+3)
5mn(a-b)/-15m³(b-a) =n/3m(分子分母同除5m(a-b))
6-2x / 9+x²-6x=2(3-x)/(x-3)^2=2/(3-x)
7a²(a+b-c) / 28ab(c-a-b) =-a/4b(分子分母同除7a(a+b-c) )
3x²-3xy / x²-2xy+y²=3x(x-y)/(x-y)^2=3x/(x-y)
4b²-a² / 4b²-4ab+a²=(2b+a)(2b-a)/(2b-a)^2=(2b+a)/(2b-a)
3x²-18x+27 / 2x²-18=3(x^2-6x+9)/2(x^2-9)=3(x-3)^2/2(x+3)(x-3)=3(x-3)/2(x+3)
因式分解8A³B²+6A³B²C-12AB³C
-8a³b²+12ab³c-6a²b;(2m-3n)²-2m+3n;因
2(a³+b³+c³)>a²(b+c)+b²(a+c)+c²
a+b+c=0,求a²/(2a²+bc)+b²/(2b²+ac)+c²
-4a³b+6a²b²-8a²b=
先化简再求值:(2ab²\a+b)³÷(ab²\a²-b²)²
3a-3b/10ab*25a²b³/a²-b² x²-4y²
2(a²+b²)(a+b)²-(a²-b²)²
已知A=3m²+mn,B=5mn-6m²-9n²,并且A-B+3C=0,求多项式C
3ab²+6a²b+3a³
计算 (a+b+c)(a²+b²+c²-ab-bc-ac)
已知三角形ABC的边长为a.b.c,且a=m²-n²,b=m²+n²,c=2mn