当x等于什么数时2x—3与3x1-搜答案-智慧作业帮

(3x+1)/2-2=（3x-2）/10-（2x+3）/5两边乘105(3x+1)-20=3x-2-2(2x+3)15x+5-20=3x-2-4x-615x-15=-x-816x=7x=7/16

2

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

X-X/3-1=7-2X/5+3两边乘于1515X-5X-15=150-6X15X-5X+6X=150+1516X=165X=165/15

(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

(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

4x+2=3x-9x=-11

(x+1)/2=-(x+2)/3两边乘以63(x+1)=-2(x+2)3x+3=-2x-43x+2x=-3-45x=-7x=-7/5当x=-7/5时,代数式2分之x+1与3分之x+2互为相反数

x-(x-1)/2=(x+3)/5-210x-5(x-1)=2(x+3)-2010x-5x+5=2x+6-203x=-19x=-19/320/3x-(x-1)/2=(x+3)/5-210x-5(x-1

(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

4/5x-6/5+2=3x-14/5x-3x=（-1）+6/5-11/5x=1/5x=-1/11

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