神马作文网当x等于什么数时-4 5x-3没有意义
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当x=-2/3时2-5=3x-13x=-2x=-2/3
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
(4X+5)/7=34X+5=214X=16X=4
3x-9=12x=7所以当X>7的时候3x-9的值大于12
X＝3,分数为0.因为分子为0X＝－3,分数没意义.因为分母为0
(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
(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
3+X/3=5两边都X3后得9+X=15X=6
(1-2x)/3+3=(3x+1)/77(1-2x)+63=3(3x+1)7-14x+63=9x+3-23x=-67∴x=67/23
若3x-4与2(x-3)互为相反数,则3x-4+2(x-3)=0即,5x-10=05x=10x=2
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
5x+6-2+3x=28x=2-6+28x=-2x=-2.5