1.Tìm x, biết:
a) 7/8 + x = 4/7 b) 6 – x = (-3)/4 c) 1/(-5) + x = 3/4 d) –6 – x = (-3)/5
e) – 2/6 + x = 5/7 f) -8 – x = (-5)/3 g) – 2/10 – x = – 9/8 h) 8 – x = (-1)/6
i) – 2/5 + x = 5/7 j) -2 – x = (-5)/3 k) – 1/6 – x = – 9/8 l) 8 – x = (-1)/5
1.Tìm x, biết:
a) 7/8 + x = 4/7
⇔ x = 4/7 – 7/8
⇔ x = -17/56
_______________________
b) 6 – x = (-3)/4
⇔ x = 6 – (-3)/4
⇔ x = 27/4
___________________
c) 1/(-5) + x = 3/4
⇔ x = 3/4 + 1/5
⇔ x = 19/20
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d) –6 – x = (-3)/5
⇔ -x = (-3)/5 +6
⇔ -x = 27/5
⇔ x = -27/5
____________________
e) – 2/6 + x = 5/7
⇔ x = 5/7 + 2/6
⇔ x = 22/21
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f) -8 – x = (-5)/3
⇔ -x = -5/3 +8
⇔ x = -19/3
_________________
g) – 2/10 – x = – 9/8
⇔ -x = -9/8 + 2/10
⇔ x = 37/40
______________________
h) 8 – x = (-1)/6
⇔ x = 8 – (-1)/6
⇔ x = 49/6
______________________
i) – 2/5 + x = 5/7
⇔ x = 5/7 + 2/5
⇔ x = 39/35
_______________________
j) -2 – x = (-5)/3
⇔ -x = (-5)/3 +2
⇔ x = -1/3
___________________
k) – 1/6 – x = – 9/8
⇔ -x = -9/8 +1/6
⇔ x = 23/24
__________________________
l) 8 – x = (-1)/5
⇔ x = 8 – (-1)/5
⇔ x = 41/5
`a, 7/8 + x = 4/7`
`⇔ x = 4/7 – 7/8`
`⇔ x = -17/56`
`b, 6 – x = (-3)/4`
`⇔ x = [6 – (-3)]/4`
`⇔ x = 27/4`
`c, 1/(-5) + x = 3/4`
`⇔ x = 3/4 + 1/5`
`⇔ x = 19/20`
`d,–6 – x = (-3)/5`
`⇔ -x = (-3)/5 +6`
`⇔ -x = 27/5`
`⇔ x = -27/5`
`e, – 2/6 + x = 5/7`
`⇔ x = 5/7 + 2/6`
`⇔ x = 22/21`
`f, -8 – x = (-5)/3`
`⇔ -x = -5/3 +8`
`⇔ x = -19/3`
`g, – 2/10 – x = – 9/8`
`⇔ -x = -9/8 + 2/10`
`⇔ x = 37/40`
`h, 8 – x = (-1)/6`
`⇔ x = [8 – (-1)]/6`
`⇔ x = 49/6`
`i, – 2/5 + x = 5/7`
`⇔ x = 5/7 + 2/5`
`⇔ x = 39/35`
` j, -2 – x = (-5)/3`
`⇔ -x = (-5)/3 +2`
`⇔ x = -1/3`
`k, – 1/6 – x = – 9/8`
`⇔ -x = -9/8 +1/6`
`⇔ x = 23/24`
`l, 8 – x = (-1)/5`
`⇔ x = [8 – (-1)]/5`
`⇔x = 41/5`
`#Study well`