当X等于什么数是x-1/3-搜答案-大师作文网

当x=-2/3时2-5=3x-13x=-2x=-2/3

16

2x+1/5和3-2/3x的值为相反数2x+1/5+3-2/3x=04x/3+16/5=0x=-12/5

x-2除以3=x+1除以2-2/3*2=X+1X=-7/3.

(x-1)/(x-3)=-(x+3)/55(x-1)=-(x+3)(x-3)x^2+5x-14=0(x+7)(x-2)=0x+7=0x1=-7x-2=0x2=2

4/7

(4X+5)/7=34X+5=214X=16X=4

（1）x/7＞9　　　x＞63（2）7x＜28　　　x＜4不懂可追问!再问：不懂

(x-1)/(x-3)=-(x+3)/55(x-1)=-(x+3)(x-3)x^2+5x-14=0(x+7)(x-2)=0x+7=0x1=-7x-2=0x2=2

-7/2

1：依题意,可列方程(4x+5)/7=34x+5=214x=16x=42：依题意,可列方程2(x-1)=1-x2x-2=1-x2x+x=1+23x=3x=1

∵代数式2分之3X-5的值是8分之1∴﹙3／2﹚X-5=1／8∴﹙3／2﹚X=1／8+5∴﹙3／2﹚X=41／8X=﹙41／8﹚×﹙2／3﹚X=41／12答：当X=41／12时,代数式2分之3X-5的

(5x+2)/3与3-(1-2x)/9互为相反数则(5x+2)/3+【3-(1-2x)/9】=0解得X=-50/17

(1-2x)/3+3=(3x+1)/77(1-2x)+63=3(3x+1)7-14x+63=9x+3-23x=-67∴x=67/23

1X=32/272X>03X

x-(2x-3)=6,可得3-x=6,x=-3你先设置我最佳答案后,我百度Hii教你.

(2x-1/3+2)+(-1)=02x+5/3-1=02x=-2/3x=-1/3

x-3/x-1=7-5/x+3（x-3）（x+3）=2（x-1）x²-9=2x-2x²-2x-7=0x²-2x+1-8=0（x-1）²=8x-1=±2√2+1

互为相反数则相加为0(4x+5)/3+(5x+2)/4=0两边乘1216x+20+15x+6=031x=-26x=-26/31

5x+6-2+3x=28x=2-6+28x=-2x=-2.5