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a, x + 1/3 = 3/4
- > x = 3/4 - 1/3 = 5/12
b, x - 2/5 = 5/4
-> x = 5/4 + 2/5 = 33/20
c, -x - 2/3 = 6/7
-> -x = 6/7 + 2/3 = 32/21
-> x = -32/21
d, 4/7 - x = 1/3
x = 4/7 - 1/3 = 5/21
a) x+1/3= 3/4
x= 3/4 - 1/3
x= 5/12
b) x-2/5 = 5/4
x= 5/4 + 2/5
x = 33 / 20
c) -x - 2/3 = 6/7
-x = 6/7 + 2/3
-x = 32/21 => x = -32/21
d) 4/7 -x = 1/3
x= 4/7 -1/3
x = 5/21
\(\left(\frac{2}{5}\right)^6:\left(\frac{2}{5}\right)^4=\left(\frac{2}{5}\right)^2=\frac{4}{25}\)
\(\left(\frac{3}{16}\right)^2:\left(\frac{9}{8}\right)^2=\frac{1}{12}\)
\(\left(\frac{2}{7}-\frac{1}{2}\right)^2=\frac{9}{196}\)
\(-\frac{4}{9}+\left(-\frac{5}{6}\right)-\frac{17}{4}=-\frac{199}{36}\)
\(-x-\frac{2}{3}=-\frac{6}{7}\)
\(\Rightarrow-x=-\frac{6}{7}+\frac{2}{3}\)
\(\Rightarrow-x=-\frac{4}{21}\)
\(\Rightarrow x=\frac{4}{21}\)
\(\frac{4}{7}-x=\frac{1}{3}\)
\(\Rightarrow x=\frac{4}{7}-\frac{1}{3}\)
\(\Rightarrow x=\frac{5}{21}\)
1. -4/9 + ( -5/6) -17/4
= -23/18 - 17/4 = -199/36
2.tìm x
a. -x - 2/3 = -6/7
-x = -6/7 +2/3
-x = -4/21
x=4/21
b. 4/7 - x = 1/3
x = 4/7 - 1/3
x =5/21
9 2 − 2 3 − x + 7 4 = − 5 4 2 3 − x + 7 4 = 9 2 − − 5 4 2 3 − x + 7 4 = 9 2 + 5 4 2 3 − x + 7 4 = 23 4 x + 7 4 = 2 3 − 23 4 x + 7 4 = 8 − 69 12 x + 7 4 = − 57 12 x + 7 4 = − 19 4 x = − 19 4 − 7 4 x = − 26 4 x = − 13 2