Tìm x giúp mk mấy câu này nha, mk sẽ cho ctlhn:
6) 1/3*(x-1)+1/2*(x+2)=0,25.
7) x-1/4*x=60-x+1/4*x.
8) (x+1/5)^2+17/25=26/25.
9) x:3/7+4/7=-2/14.
10) 7/9:(2+3/4x)+5/9=23/27.
11) (x+1/2)*(2/3-2x)=0.
12) -1-(3x-7/9)^3=7.
13*) 4(x+2)²+|(-3)x-6|+16=(-5)²+41.
Đáp án:
Giải thích các bước giải: x-1/3 + x+2/2=0,25
2x-2/6 + 3x+6/6=0,25
5x+4=1,5
5x=-2,5
x=-0,5
7)x-1=60-x+1
2x=62
x=31
8)(x+1/5)^2=9/25
x+1/5=3/5 hoac x+1/5=-3/5
x=2/5 hoac x=-4/5
9)x:3/7=-5/7
x=-15/49
10)7/9 : 5/4x=8/27
28x/45=8/27 (chia nghich dao)
28x=40/3
x=10/21
11)x+1/2=0 hoac 2/3-2x=0
suy ra:x=-1/2 hoac 2x=2/3
suy ra:x=-1/2 hoac x=1/3
12) (3x-7/9)^3=-8
3x-7/9=-2
3x=-11/9
x=-11/27
13)ko lam duoc.
`1/3*(x-1)+1/2*(x+2)=0,25`
`<=>1/3x-1/3+1/2x+1=0,25`
`<=>5/6x+7/12=0`
`<=>5/6x=-7/12`
`<=>x=-7/10`
`x-1/4*x=60-x+1/4*x`
`<=>x-x/4=60-x+x/4`
`<=>3x=240-3x`
`<=>x=40`
`(x+1/5)^2+17/25=26/25`
`<=>(x+1/5)^2=9/25`
`<=>x=2/5` hoặc `x=-4/5`
`x/(3/7)+4/7=-2/14`
`<=>(7x)/3+4/7=-2/14`
`<=>x=-(15/7*7)`
`<=>x=-15/49`
`7/9:(2+3/4x)+5/9=23/27`
`<=>7/(9(2+(3x)/4)+5/9=23/27`
`<=>(8*9(2+(3x)/4)/27=7`
`<=>x/4=5/24`
`<=>x=5*4:24`
`<=>x=5/6`
`(x+1/2)*(2/3-2x)=0.`
`<=>x=-1/2` hoặc `x=1/3`
`-1-(3x-7/9)^3=7`
`<=>-(3x-7/9)^2=8`
`<=>x=-11/27`