a x + 5,6 = 7,1
b 3/7x – 0,4= 10
c 0,2.(x-3) +2,4 = 10 3
d (x :2,2 ). 1/6 +-3/8.(0,5-1—- )
5
e 0,75x -2,1 = -6,6
a x + 5,6 = 7,1 b 3/7x – 0,4= 10 c 0,2.(x-3) +2,4 = 10 3 d (x :2,2 ). 1/6 +-3/8.(0,5-1—- )
By Hadley
a) `x+5,6=7,1`
`x=7,1-5,6`
`x=1,5`
b) `3/7 x – 0,4 = 10`
`3/7 x = 10,4`
`x=364/15`
c) `0,2.(x-3)+2,4=10`
`0,2 . (x-3) = 7,6`
`x-3=38`
`x=41`
d) `(x:2,2) . 1/6 – 3/8 . (0.5 – 1 3/5) =0`
`(x:2,2) . 1/6 – 3,8 . (-11/10)=0`
`(x:2,2) . 1/6 = 209/50`
`x:2,2=209/90`
`x=2299/400`
e) `0,75x – 2,1=-6,6`
`0,75x = -4,5`
`x=-6`
`a,x + 5,6 =7,1`
`x = 7,1 – 5,1`
`x = 2`
`b,3/7x – 0,4= 10`
`3/7x=10 + 0,4`
`3/7x=10,4`
`3/7x=104/10`
`x=104/10÷3/7`
`x=364/15`
`c,0,2.(x-3) +2,4 = 10`
`0,2(x-3)=10-2,4`
`0,2(x-3)=7,6`
`x-3=7,6÷0,2`
`x-3=38`
`x=38+3`
`x=41`
`d,(x ÷ 2,2 ). 1/6 +(-3/8).(0,5-1 3/5)`
`⇒` Thiếu đề
`e,0,75x -2,1 = -6,6`
`0,75x=(-6,6)+2,1`
`0,75x=-4,5`
`x=(-4,5)÷0,75`
`x=-6`
Xin hay nhất !