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26,72+13/100+21/4=42,1
1/4+17/50+31/100=0,9
3/4+15/40+69/300=1,355
42/700+42/120+17/80=0,6225
nha ban
chuc ban hoc gioi
a)26,72+13/100 +21/40 = 5344/200+26/200+105/200=(5344+26+105)/200=219/8=27,375
c)3/4+15/40+69/300=150/200+75/200+46/200=(150+75+46)/200=271/200=1,355
26,72 + \(\frac{13}{100}\) + \(\frac{21}{40}\)
= 26,72 + 0,13 + 0,525
= 26,85 + 0,525
= 27,375
\(\frac{1}{4}+\frac{17}{50}+\frac{31}{100}\)
= 0,25 + 0,34 + 0,31
= 0,59 + 0,31
= 0,9
\(\frac{3}{4}+\frac{15}{40}+\frac{69}{300}\)
= 0,75 + 0,375 + 0,23
= 1,125 + 0,23
= 1,355
\(\frac{42}{700}+\frac{42}{120}+\frac{17}{80}\)
= 0,06 + 0,35 + 0,2125
= 0,41 + 0,2125
= 0,6225
\(\frac{14}{7}\):\(\frac{7}{34}\)x\(\frac{1}{8}\)
=\(\frac{14}{7}\)x\(\frac{34}{7}\)x\(\frac{1}{8}\)
=2x\(\frac{34}{7}\)x\(\frac{1}{8}\)
=\(\frac{68}{7}\)x\(\frac{1}{8}\)
=\(\frac{68}{56}\)=\(\frac{37}{28}\)
Hok tốt!
\(\dfrac{4}{5}+x=3\dfrac{1}{5}\)
\(\Leftrightarrow\dfrac{4}{5}+x=\dfrac{16}{5}\)
\(\Leftrightarrow0,8+x=3,2\)
\(\Leftrightarrow x=3,2-0,8\)
\(\Leftrightarrow x=2,4\)
\(\dfrac{4}{5}+x=3\dfrac{1}{5}\)
⇔ \(\dfrac{4}{5}+x=\dfrac{16}{5}\)
⇔ \(x=\dfrac{12}{5}=2,4\)
- 1/4+17/50 +31/100=25/100+34/100+31/100 =90/100=0,9
- 3/4 +15/40+69/300=0,75+0,375+0,23=1,355
- 42/700+45/120+17/80=0,06+0,375+0,2125 = 0,6475
k cho mk vs