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\(a.\left(y.100-0,7357\right):0,01=0,55+15,88\)
\(\Leftrightarrow\left(100y-0,7357\right):0,01=16,43\)
\(\Leftrightarrow100y-0,7357=0,1643\)
\(\Leftrightarrow100y=0,9\)
\(\Leftrightarrow y=\frac{9}{1000}\)
\(b.14:\left(0,4+\frac{0,16}{y}\right)=7\)
\(\Leftrightarrow0,4+\frac{0,16}{y}=2\)
\(\Leftrightarrow\frac{0,16}{y}=1,6\)
\(\Leftrightarrow x=0,1\)
\(c.520+7,5.4=y+\frac{175}{5}+30\)
\(\Leftrightarrow520+30=y+65\)
\(\Leftrightarrow550=y+65\)
\(\Leftrightarrow y=485\)
Bài 2:
a, \(\dfrac{5}{23}\) \(\times\) \(\dfrac{17}{26}\) + \(\dfrac{5}{23}\) \(\times\) \(\dfrac{9}{26}\)
= \(\dfrac{5}{23}\) \(\times\) ( \(\dfrac{17}{26}\) + \(\dfrac{9}{26}\))
= \(\dfrac{5}{23}\) \(\times\) \(\dfrac{26}{26}\)
= \(\dfrac{5}{23}\)
b, \(\dfrac{3}{4}\) \(\times\) \(\dfrac{7}{9}\) + \(\dfrac{7}{4}\) \(\times\) \(\dfrac{3}{9}\)
= \(\dfrac{7}{12}\) + \(\dfrac{7}{12}\)
= \(\dfrac{14}{12}\)
= \(\dfrac{7}{6}\)
a) ( 1/2-1/3-1/6).(1/2+2/3+3/4+...+2017/2018) + 3/4.x = 9/10
0.(1/2+2/3+3/4+...+2017/2018) + 3/4.x = 9/10
0+3/4.x = 9/10
3/4.x = 9/10
x = 9/10: 3/4
x = 6/5
b) x + ( 3/1.3+3/3.5+...+3/13.15) = 11/5
x + 3/2. ( 1-1/3 + 1/3 - 1/5 + ...+ 1/13 - 1/15) = 11/5
x + 3/2. ( 1-1/15) = 11/5
x + 3/2.14/15 = 11/5
x + 7/5 = 11/5
x = 11/5 - 7/5
x = 4/5
a, 1-3/7+4/7
= 1-7/7
= 1-1
= 0
b,3-7/9+2/9
= 3- 9/9
= 3- 1
= 2
c,=73/126