还有20个解方程。写的好的我加50分!!!!
是每种20道 还有 是化简求值 你怎么没说未知数的值是多少喃 谢谢你把答案写起 只不过答案是我自己写 谢谢 你们回答得太慢了 我昨天就做完了
æ¹ç¨ï¼1.4x+2=x+7
3x=5
x=5/3
2.3-6x-4=2/3
-6x=5/3
x=-5/18
3.(4x+2)/6-(5x-1)/6
-x+3=6x=-3
4.4x/(2x+6)+1=7/(2x+6)
7-4x=2x+6
x=1/6
åç®
7(2x-1)-3(4x-1)=4(3x+2)-1;
(5y+1)+ (1-y)= (9y+1)+ (1-3y);
20%+(1-20%)(320-x)=320Ã40%
2(x-2)+2=x+1
2(x-2)-3(4x-1)=9(1-x)
x/3 -5 = (5-x)/2
2(x+1) /3=5(x+1) /6 -1
(1/5)x +1 =(2x+1)/4
(5-2)/2 - (4+x)/3 =1
x/3 -1 = (1-x)/2
(x-2)/2 - (3x-2)/4 =-1
11x+64-2x=100-9x
15-(8-5x)=7x+(4-3x)
3(x-7)-2[9-4(2-x)]=22
3/2[2/3(1/4x-1)-2]-x=2
2(x-2)-3(4x-1)=9(1-x)
11x+64-2x=100-9x
15-(8-5x)=7x+(4-3x)
3(x-7)-2[9-4(2-x)]=22
3/2[2/3(1/4x-1)-2]-x=2
2(x-2)+2=x+1
æçæ°å°è¿ä¸ªç½ç«http://wenku.baidu.com/view/f8d6d6a6f524ccbff12184ca.html
3x=5
x=5/3
2.3-6x-4=2/3
-6x=5/3
x=-5/18
3.(4x+2)/6-(5x-1)/6
-x+3=6x=-3
4.4x/(2x+6)+1=7/(2x+6)
7-4x=2x+6
x=1/6
åç®
7(2x-1)-3(4x-1)=4(3x+2)-1;
(5y+1)+ (1-y)= (9y+1)+ (1-3y);
20%+(1-20%)(320-x)=320Ã40%
2(x-2)+2=x+1
2(x-2)-3(4x-1)=9(1-x)
x/3 -5 = (5-x)/2
2(x+1) /3=5(x+1) /6 -1
(1/5)x +1 =(2x+1)/4
(5-2)/2 - (4+x)/3 =1
x/3 -1 = (1-x)/2
(x-2)/2 - (3x-2)/4 =-1
11x+64-2x=100-9x
15-(8-5x)=7x+(4-3x)
3(x-7)-2[9-4(2-x)]=22
3/2[2/3(1/4x-1)-2]-x=2
2(x-2)-3(4x-1)=9(1-x)
11x+64-2x=100-9x
15-(8-5x)=7x+(4-3x)
3(x-7)-2[9-4(2-x)]=22
3/2[2/3(1/4x-1)-2]-x=2
2(x-2)+2=x+1
æçæ°å°è¿ä¸ªç½ç«http://wenku.baidu.com/view/f8d6d6a6f524ccbff12184ca.html
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第1个回答 2011-02-14
瓜批,,垃圾
第2个回答 2011-02-14
化简求值
(1) 5a-2b+3b-4a-1 a= -1 b=2
(2)7x2-3x2-2x-2x2=5=6x x= -2
(3)2X―[6-2(X-2)] 其中 X=-2
(4).(5a+2a2-3-4a3)-(-a+3a3-a2),其中a=-2
(5)3x2+4x-2x2-x+x2-3x-1 其中x= -3
(6)-3[y-(3x2-3xy)]-[y+2(4x2-4xy)],其中x=2, y=1/2
(7)2x2-3xy+y2-2xy-2x2+5xy-2y+1 其中x=22/7
(8)2x2y+4x2y-3xy2-5xy2 其中x=1 y= -1
(9)9x+6x22 -3(x-2/3x22).其中x=-2
(10)1/4(-4x2+2x-8)-(1/2x-1) 其中x=1/2
(11)3x'y-[2x'y-(2xyz-x'z)-4x'z]-xyz,其中x=-2,y=-3,z=1,
、(12)(5a^2-3b^2)+(a^2+b^2)-(5a^2+3b^2),其中a=-1,b=1
(13)2(a^2b+ab^2)-2(a^2 b-1)-2ab^2 -2其中a=-2,b=2
(14)(3x-5y)+(-3+y)其中x=5,y=3
(15).【(X+1)(X+2)-2】÷X,其中X=-3
16.(2x2-x-1)-(x2-x- )+3(x2-1 ),其中x=1
17.当a=-1,b=-2时[a-(b-c)]-[-b-(-c-a)]=? ,
18.当a=-1,b=1,c=-1时-[b-2(-5a)]-(-3b+5c)
19.(x2+y2)+(-3xy-(x2-y2)),其中x=-1,y=2
20.(8xy-3x2)-5x-2(3xy-2x2) x=-1 y=1/2
方程:
7(2x-1)-3(4x-1)=4(3x+2)-1;
(5y+1)+ (1-y)= (9y+1)+ (1-3y);
[ ( )-4 ]=x+2;
20%+(1-20%)(320-x)=320×40%
2(x-2)+2=x+1
2(x-2)-3(4x-1)=9(1-x)
11x+64-2x=100-9x
15-(8-5x)=7x+(4-3x)
3(x-7)-2[9-4(2-x)]=22
3/2[2/3(1/4x-1)-2]-x=2
1 2x-10.3x=15
2 0.52x-(1-0.52)x=80
3 x/2+3x/2=7
4 3x+7=32-2x
5 3x+5(138-x)=540
6 3x-7(x-1)=3-2(x+3)
7 18x+3x-3=18-2(2x-1)
8 3(20-y)=6y-4(y-11)
9 -(x/4-1)=5
10 3[4(5y-1)-8]=6
10/3 (x/5+3/7)=9x/2
5/3(x+0.5)+2=3x-6
5x+2(2x/3+2)=2/3(x-6)+2
(2x-7)/2-(6x-5)/3=2x+3
(3x+2)/5-(x-6)=x/3
6x-(x/3+2)=2(x/5+5/2)-3
3(x/11-2)-5=2+3x/3
10/3(2x-6)=3/5
x/2-(x/3-2)=3
2/3(x+3)-3=5x/3
5/3(2x-5/3)=2x/5-8/9
25(x/3-x/2+2/5)-2=3/5(x-2/7)+4/9
(1) 5a-2b+3b-4a-1 a= -1 b=2
(2)7x2-3x2-2x-2x2=5=6x x= -2
(3)2X―[6-2(X-2)] 其中 X=-2
(4).(5a+2a2-3-4a3)-(-a+3a3-a2),其中a=-2
(5)3x2+4x-2x2-x+x2-3x-1 其中x= -3
(6)-3[y-(3x2-3xy)]-[y+2(4x2-4xy)],其中x=2, y=1/2
(7)2x2-3xy+y2-2xy-2x2+5xy-2y+1 其中x=22/7
(8)2x2y+4x2y-3xy2-5xy2 其中x=1 y= -1
(9)9x+6x22 -3(x-2/3x22).其中x=-2
(10)1/4(-4x2+2x-8)-(1/2x-1) 其中x=1/2
(11)3x'y-[2x'y-(2xyz-x'z)-4x'z]-xyz,其中x=-2,y=-3,z=1,
、(12)(5a^2-3b^2)+(a^2+b^2)-(5a^2+3b^2),其中a=-1,b=1
(13)2(a^2b+ab^2)-2(a^2 b-1)-2ab^2 -2其中a=-2,b=2
(14)(3x-5y)+(-3+y)其中x=5,y=3
(15).【(X+1)(X+2)-2】÷X,其中X=-3
16.(2x2-x-1)-(x2-x- )+3(x2-1 ),其中x=1
17.当a=-1,b=-2时[a-(b-c)]-[-b-(-c-a)]=? ,
18.当a=-1,b=1,c=-1时-[b-2(-5a)]-(-3b+5c)
19.(x2+y2)+(-3xy-(x2-y2)),其中x=-1,y=2
20.(8xy-3x2)-5x-2(3xy-2x2) x=-1 y=1/2
方程:
7(2x-1)-3(4x-1)=4(3x+2)-1;
(5y+1)+ (1-y)= (9y+1)+ (1-3y);
[ ( )-4 ]=x+2;
20%+(1-20%)(320-x)=320×40%
2(x-2)+2=x+1
2(x-2)-3(4x-1)=9(1-x)
11x+64-2x=100-9x
15-(8-5x)=7x+(4-3x)
3(x-7)-2[9-4(2-x)]=22
3/2[2/3(1/4x-1)-2]-x=2
1 2x-10.3x=15
2 0.52x-(1-0.52)x=80
3 x/2+3x/2=7
4 3x+7=32-2x
5 3x+5(138-x)=540
6 3x-7(x-1)=3-2(x+3)
7 18x+3x-3=18-2(2x-1)
8 3(20-y)=6y-4(y-11)
9 -(x/4-1)=5
10 3[4(5y-1)-8]=6
10/3 (x/5+3/7)=9x/2
5/3(x+0.5)+2=3x-6
5x+2(2x/3+2)=2/3(x-6)+2
(2x-7)/2-(6x-5)/3=2x+3
(3x+2)/5-(x-6)=x/3
6x-(x/3+2)=2(x/5+5/2)-3
3(x/11-2)-5=2+3x/3
10/3(2x-6)=3/5
x/2-(x/3-2)=3
2/3(x+3)-3=5x/3
5/3(2x-5/3)=2x/5-8/9
25(x/3-x/2+2/5)-2=3/5(x-2/7)+4/9
第3个回答 2011-02-14
这个想想......