giúp mik
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(68X75+5X32X150):25-5500:25
=(5100+160X150):25-5500:25
=(5100+24000):25-5500:25
=29100:25-5500:25
=1164-220
=994
\(\dfrac{5}{28}\):\(\dfrac{10}{7}\)x100
=\(\dfrac{5}{28}\)x\(\dfrac{7}{10}\)x100
=\(\dfrac{1}{8}\)x100
=12,5%
AB=AC+CB=3CB+CB=4CB
=>4CB=40
=>CB=10
=>AC=40-10=30
b
C là trung điểm của BM =>CM=CB =>BM=2CB=>BM=2*10=20
=>AM=40-20=20
A = \(\dfrac{1}{20}\) + \(\dfrac{1}{30}\) + \(\dfrac{1}{42}\) + \(\dfrac{1}{56}\) + \(\dfrac{1}{72}\) + \(\dfrac{1}{90}\) + \(\dfrac{1}{110}\) + \(\dfrac{1}{132}\)
A = \(\dfrac{1}{4\times5}\) + \(\dfrac{1}{5\times6}\) + \(\dfrac{1}{6\times7}\)+ \(\dfrac{1}{7\times8}\)+\(\dfrac{1}{8\times9}\)+ \(\dfrac{1}{9\times10}\) + \(\dfrac{1}{10\times11}\)+\(\dfrac{1}{11\times12}\)
A = \(\dfrac{1}{4}\)-\(\dfrac{1}{5}\) +\(\dfrac{1}{5}\)-\(\dfrac{1}{6}\) +.....+\(\dfrac{1}{11}\) - \(\dfrac{1}{12}\)
A = \(\dfrac{1}{4}\) - \(\dfrac{1}{12}\)
A = \(\dfrac{1}{6}\)
`1/10+2/20+3/30+4/40+5/50+6/60+7/70+8/80+9/90`
`=1/10+1/10+1/10+1/10+1/10+1/10+1/10+1/10+1/10`
`=1/10xx9`
`=9/10`