Toán Lớp 6: tìm x
a, x – 7/12 =3/12
b,12/15 – x = – 5/8
c,-2 x + 5/7 = -5/15 – 3/14
d, 9 – 5 x = – 6/18 + 2/7
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Toán Lớp 6: tìm x
a, x – 7/12 =3/12
b,12/15 – x = – 5/8
c,-2 x + 5/7 = -5/15 – 3/14
d, 9 – 5 x = – 6/18 + 2/7
giúp em với ạ
em cảm ơn
Comments ( 2 )
Giải đáp+Lời giải và giải thích chi tiết:
a,
x-\frac{7}{12}=\frac{3}{12}
=>x=\frac{3}{12}+\frac{7}{12}
=>x=\frac{5}{6}
Vậy x=\frac{5}{6}
b,
\frac{12}{15}-x=\frac{-5}{8}
=>x=\frac{12}{15}–\frac{5}{8}
=>x=\frac{57}{40}
Vậy x=\frac{57}{40}
c,
-2x+\frac{5}{7}=\frac{-5}{15}-\frac{3}{14}
=>-2x+\frac{5}{7}=\frac{-23}{42}
=>-2x=\frac{-23}{42}-\frac{5}{7}
=>-2x=\frac{-53}{42}
=>x=\frac{-53}{42}:(-2)
=>x=\frac{53}{84}
Vậy x=\frac{53}{84}
d,
9-5x=\frac{-6}{18}+\frac{2}{7}
=>9-5x=\frac{-1}{21}
=>5x=9-\frac{-1}{21}
=>5x=\frac{190}{21}
=>x=\frac{190}{21}:5
=>x=\frac{38}{21}
Vậy x=\frac{38}{21}
a) x – 7/12 = 3/12
=> x = 3/12 + 7/12
=> x = 10/12 = 5/6
Vậy x = 5/6
b) 12/15 – x = -5/8
=> x = 12/15 – (-5)/8
=> x = 12/15 + 5/8
=> x = 96/120 + 75/120
=> x = 171/120 = 57/40
Vậy x = 57/40
c) -2x + 5/7 = (-5)/15 – 3/14
=> -2x + 5/7 = (-23)/42
=> -2x = (-23)/42 – 5/7
=> -2x = (-53)/42
=> x = (-53)/42 : (-2)
=> x = 53/84
Vậy x = 53/84
d) 9 – 5x = -6/18 + 2/7
=> 9 – 5x = -1/21
=> 5x = 9 – (-1)/21
=> 5x = 190/21
=> x = 190/21 : 5
=> x = 38/21
Vậy x = 38/21