2/3 -4.1/2+3/4
-5/9.3/11+(-13/18).3/11
(-1/5+3/7) :2/11+(-4/5+4/7):2/11
3.tìm x biết
-3/8 – x=5/12
-5/8 -x=-3/20 – (-1/6)
x – 3/4=5/2
x:(-4 2/7)= -4 1/5
(5,75):x=14/23
2/3 -4.1/2+3/4 -5/9.3/11+(-13/18).3/11 (-1/5+3/7) :2/11+(-4/5+4/7):2/11 3.tìm x biết -3/8 – x=5/12 -5/8 -x=-3/20 – (-1/6) x – 3/4=5/2 x:(-4 2/7)= -4 1
By Isabelle
a) `2/3 -4. 1/2+3/4`
`=2/3 – 2 +3/4`
`=16/24 – 48/24 + 18/24`
`=$\frac{16-48+18}{24}$
`=$\frac{-14}{24}$
b)`-5/9. 3/11+(-13/18).3/11`
`=3/11.(-5/9-13/18)`
`=3/11.(-10/18 – 13/18)`
`=3/11. -23/18`
`=-23/66`
c)(-$\frac{1}{5}$ +$\frac{3}{7}$ ):$\frac{2}{11}$ +($-\frac{4}{5}$ +$\frac{4}{7}$ ):$\frac{2}{11}$
`= (-1/5+3/7) . 11/2+(-4/5+4/7) . 11/2`
`=11/2.(-1/5+3/7-4/5+4/7)`
`=11/2.(-1/5-4/5+3/7+4/7)`
`=11/2.(-1+1)`
`=11/2.0`
`=0`
3. tìm x
`a)-3/8 – x=5/12`
`⇒x= -3/8 -5/12`
`⇒x=-19/24`
`b)-5/8 -x=-3/20 – (-1/6)`
`⇒-5/8 -x=1/60`
`⇔x=-5/8 -1/60 =-77/120`
c)`x – 3/4=5/2`
`⇒x=5/2 + 3/4`
`⇒x=13/4`
d)`x:($-4\frac{2}{7}$ )= $-4\frac{1}{5}$`
`⇒ x : -30/7 = -21/5`
`⇒x= -21/5 . -30/7`
`⇒x=18`
e)`(5,75):x=14/23`
`⇒x= 5,75 : 14/23`
`⇒x=529/56`
Đáp án:
Giải thích các bước giải:
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