1.c/2ab+b/3a^2c-a/5c^2
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1.c/2ab+b/3a^2c-a/5c^2
2.2x+2+(5/x-1)
3.(a+1/a^2+3a+2)+(a+3/a^2+7a+12)
4.(x/a-y+y/y-x)/(xy/x-y)
5.(3-m/2m-4)/(m+2-5/m-2)
6.(a+1/2a-2 -3/2a^2-2 -a+3/2a+2)* 4a^-4/3
7.(a-b/a+b-a+b/a-b)/(1- a^2+b^2/a^2-2ab+b^2)
8.[(1+ 4/x-2)(x-4+ 4/x)-3]/(4/x -1)
9.[1/a^2 + 1/b^2 + (2/a+b)(1/a+1/b]/[(a+b)^2/ab]
10.已知x^2-3x+1=0求 1.x+1/x 2.x^2+1/x^2 3.x^4+1/x^4的值
11.化简x-2/x^9-9(1+ 2x-7/x^2-4x+4)/ 1/x+3 并求x=2006时的值
12.化简(x^2+4x+4/x^2-6x+9 -2+ 9-6x+x^2/4+4x+x^2)*x^2-x-6/4x^2-4x-1
麻烦有过程都写出来
2.2x+2+(5/x-1)
3.(a+1/a^2+3a+2)+(a+3/a^2+7a+12)
4.(x/a-y+y/y-x)/(xy/x-y)
5.(3-m/2m-4)/(m+2-5/m-2)
6.(a+1/2a-2 -3/2a^2-2 -a+3/2a+2)* 4a^-4/3
7.(a-b/a+b-a+b/a-b)/(1- a^2+b^2/a^2-2ab+b^2)
8.[(1+ 4/x-2)(x-4+ 4/x)-3]/(4/x -1)
9.[1/a^2 + 1/b^2 + (2/a+b)(1/a+1/b]/[(a+b)^2/ab]
10.已知x^2-3x+1=0求 1.x+1/x 2.x^2+1/x^2 3.x^4+1/x^4的值
11.化简x-2/x^9-9(1+ 2x-7/x^2-4x+4)/ 1/x+3 并求x=2006时的值
12.化简(x^2+4x+4/x^2-6x+9 -2+ 9-6x+x^2/4+4x+x^2)*x^2-x-6/4x^2-4x-1
麻烦有过程都写出来
1.c/2ab+b/3a^2c-a/5c^2
=(15a*c^2+10b^2-6a^3*b)/30a^2*b*c^2
2.2x+2+(5/x-1)
=2x+5/x+1
3.(a+1/a^2+3a+2)+(a+3/a^2+7a+12)
=(a+2)+(a+4)
=2a+6
4.[x/(x-y)+y/(y-x)]/(xy/x-y)
=1/y+1/x
5.[(3-m)/(2m-4)]/[m+2-5/(m-2)]
=-1/2(m+3)
6.(a+1/2a-2 -3/2a^2-2 -a+3/2a+2)* 4a^-4/3
=[(a+1)^2-3-(a+3)(a-1)]/(a^2-1)*4a^-4/3
=(4a^-4/3 )/(a^2-1)
7.(a-b/a+b-a+b/a-b)/(1- a^2+b^2/a^2-2ab+b^2)
=[-4ab/(a^2-b^2)]/[-2ab/(a-b)^2]
=2(a-b)^2/(a^2-b^2)
8.[(1+ 4/x-2)(x-4+ 4/x)-3]/(4/x -1)
={[(x^2-4)/x]-3}/[(4-x)/x]
=-x-1
9.[1/a^2 + 1/b^2 + (2/a+b)(1/a+1/b]/[(a+b)^2/ab]
=(1/a^2+1/b^2+2/ab)[ab/(a+b)^2]
=1/ab
10.已知x^2-3x+1=0求 1.x+1/x 2.x^2+1/x^2 3.x^4+1/x^4的值
x^2-3x+1=0,两边都除以x
得x+1/x=3
平方x^2+2+1/x^2=9
得x^2+1/x^2=7
同理x^4+1/x^4=47
11.化简x-2/x^9-9(1+ 2x-7/x^2-4x+4)/ 1/x+3 并求x=2006时的值
x-2/x^9-9(1+ 2x-7/x^2-4x+4)/ 1/x+3
这个题目你再写清楚点,实在不好做.
12.化简(x^2+4x+4/x^2-6x+9 -2+ 9-6x+x^2/4+4x+x^2)*x^2-x-6/4x^2-4x-1
=[5(2x-1)/(x-3)^2-5(2x-1)/(x+2)^2]*(x-3)(x+2)/(2x-1)^2
=25/(x+2)(x-3)
=(15a*c^2+10b^2-6a^3*b)/30a^2*b*c^2
2.2x+2+(5/x-1)
=2x+5/x+1
3.(a+1/a^2+3a+2)+(a+3/a^2+7a+12)
=(a+2)+(a+4)
=2a+6
4.[x/(x-y)+y/(y-x)]/(xy/x-y)
=1/y+1/x
5.[(3-m)/(2m-4)]/[m+2-5/(m-2)]
=-1/2(m+3)
6.(a+1/2a-2 -3/2a^2-2 -a+3/2a+2)* 4a^-4/3
=[(a+1)^2-3-(a+3)(a-1)]/(a^2-1)*4a^-4/3
=(4a^-4/3 )/(a^2-1)
7.(a-b/a+b-a+b/a-b)/(1- a^2+b^2/a^2-2ab+b^2)
=[-4ab/(a^2-b^2)]/[-2ab/(a-b)^2]
=2(a-b)^2/(a^2-b^2)
8.[(1+ 4/x-2)(x-4+ 4/x)-3]/(4/x -1)
={[(x^2-4)/x]-3}/[(4-x)/x]
=-x-1
9.[1/a^2 + 1/b^2 + (2/a+b)(1/a+1/b]/[(a+b)^2/ab]
=(1/a^2+1/b^2+2/ab)[ab/(a+b)^2]
=1/ab
10.已知x^2-3x+1=0求 1.x+1/x 2.x^2+1/x^2 3.x^4+1/x^4的值
x^2-3x+1=0,两边都除以x
得x+1/x=3
平方x^2+2+1/x^2=9
得x^2+1/x^2=7
同理x^4+1/x^4=47
11.化简x-2/x^9-9(1+ 2x-7/x^2-4x+4)/ 1/x+3 并求x=2006时的值
x-2/x^9-9(1+ 2x-7/x^2-4x+4)/ 1/x+3
这个题目你再写清楚点,实在不好做.
12.化简(x^2+4x+4/x^2-6x+9 -2+ 9-6x+x^2/4+4x+x^2)*x^2-x-6/4x^2-4x-1
=[5(2x-1)/(x-3)^2-5(2x-1)/(x+2)^2]*(x-3)(x+2)/(2x-1)^2
=25/(x+2)(x-3)
已知a,b,c是实数,求证a*a+b*b+c*c>=ab+3b+2c
(a-b)(b-c)(c-a)/(b-a)(a-c)2(c-b)3
如果a、b、c是勾股数,那么(ab)/(a+b+c)=(a+b-c)/2
已知:a是最小的正整数,b,c是有理数,并且|a+b|+(3a+2c)*(3a+2c)=0.4ab+c/-a*-a+c*
1.若实数a、b、c满足a²+b²+c²+4≤ab+3b+2c,则200a+900b+8c
已知|c+3|+根号a-1+(a+b+c)的平方=0,求c/ab+c/(a+1)(b+1)+c/(a+2)(b+2)+.
(a+b-c)^5(a-b-c)^2(c-a-b)^4(c+b-a)^3 计算
5a-{-3b+[6c-2a-(a-c)]}-[9a-(7b+c)]
1.A=3a^2+4ab-1/2b^2,B=5a^2-2ab,且2A-B+C=0(A不等于a,B不等于b,C不等于c),
a-b=5,b-c=3,(c-a)(2b-a-c)=
计算a^2-bc/(a+b)(a+c)+b^2-ac/(b+c)(b+a)+c^2-ab/(c+a)(c+b)
已知a+b+c=0,求a*a/(2a*a+bc)+b*b/(2b*b+ac)+c*c/(2c*c+ab)