\(\frac{7}{10}\)- y = 0,5 + 0,68
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) 10/ 7 − y · 4 3 = 5 1
y · 4 3 = 10 7 − 5 1
y · 4 3 = 2 1 y = 2 1 : 4 3
y = 2 1 · 3 4
y = 3 2
\(B=\frac{x}{y}+\frac{\frac{1}{4}+\frac{5}{8}-\frac{7}{13}}{-\frac{2}{12}-\frac{10}{24}+\frac{14}{39}}\)
\(B=\frac{x}{y}+\frac{\frac{1}{4}+\frac{5}{8}-\frac{7}{13}}{-\left(\frac{2}{12}+\frac{10}{24}-\frac{14}{39}\right)}\)
\(B=\frac{x}{y}+\frac{\frac{1}{4}+\frac{5}{8}-\frac{7}{13}}{-\frac{2}{3}\left(\frac{1}{4}+\frac{5}{8}-\frac{7}{13}\right)}\)
\(B=\frac{x}{y}+\frac{1}{-\frac{2}{3}}\)
\(B=\frac{x}{y}-\frac{3}{2}\)
Thế x = 0, 5 = 1/2 ; y = 3 ta được :
\(B=\frac{\frac{1}{2}}{3}-\frac{3}{2}=\frac{1}{6}-\frac{9}{6}=-\frac{8}{6}=-\frac{4}{3}\)
Ta có:\(B=\frac{x}{y}+\frac{\frac{1}{4}+\frac{5}{8}-\frac{7}{13}}{\frac{-2}{12}-\frac{10}{24}+\frac{14}{39}}\)
\(B=\frac{x}{y}+\frac{\frac{1}{4}+\frac{5}{8}-\frac{7}{13}}{-\left(\frac{2}{12}+\frac{10}{24}-\frac{14}{39}\right)}\)
\(B=\frac{x}{y}+\frac{\frac{1}{4}+\frac{5}{8}-\frac{7}{13}}{-\frac{2}{3}\left(\frac{1}{4}+\frac{5}{8}-\frac{7}{13}\right)}\)
\(B=\frac{x}{y}+\frac{1}{-\frac{2}{3}}\)(Do\(\frac{1}{4}+\frac{5}{8}-\frac{7}{13}\ne0\))
\(B=\frac{x}{y}-\frac{3}{2}\)
Thay x = 0,5; y = 3 vào B ta được:
\(B=\frac{0,5}{3}-\frac{3}{2}\)
\(B=\frac{1}{6}-\frac{3}{2}\)
\(B=\frac{1}{6}-\frac{9}{6}\)
\(B=-\frac{4}{3}\)
Vậy\(B=-\frac{4}{3}\)tại x = 0,5; y = 3
Linz
\(\left| { - \sqrt 7 } \right| = \sqrt 7 ;\,\,\,\,\left| {\,52,\left( 1 \right)} \right| = \,52,\left( 1 \right);\,\,\,\,\,\left| {0,68} \right| = 0,68;\,\,\,\,\,\,\left| { - \frac{3}{2}} \right| = \frac{3}{2};\,\,\,\,\,\left| {2\pi } \right| = 2\pi .\)
C,\(230+4+\frac{3}{10}+\frac{7}{100}\)
\(=230+4+0,3+0,07\)
\(=234+0,3+0,07\)
\(=234,3+0,07\)
\(=234,37\)
D,\(500+7+\frac{9}{1000}\)
\(=500+7+0,009\)
\(=507+0,009\)
\(=507,009\)
Bai 2
C1 ( 2,04 + 3,4 ) : 0,68
= 5,44 : 0,68
= 8
C2 ( 2,04 + 3,4 ) : 0,68
= 2,04 : 0,68 + 3,4 : 0,68
= 3 + 5
= 8
c)234+\(\frac{3}{10}\)+\(\frac{7}{100}\)
=234+0,3+0,07
=234,37
d)507+\(\frac{9}{1000}\)
=507+0,009
=507,009
bài 2:
c1:(2,04+3,4):0,68
=5,44:0,68
=8
c2:(2,34+3,4):0,68
=2,34:0,68+3,4:0,68
=3+5
=8
\(\frac{7}{10}-y=0,5+0,68\)
\(\frac{7}{10}-y=1,18\)
\(y=\frac{7}{10}-1,18\)
\(y=-0,48\)
bạn gì ơi số kia to thế sao trừ đc