Ta có:
\(74\frac{19}{35}.\frac{7}{90}+15\frac{16}{35}:\frac{90}{7}\)
\(=74\frac{19}{35}.\frac{7}{90}+15\frac{16}{35}.\frac{7}{90}\)
\(=\frac{7}{90}.\left(74\frac{19}{35}+15\frac{16}{35}\right)\)
\(=\frac{7}{90}.90\)
\(=7\)
\(74\frac{19}{35}.\frac{7}{90}+15\frac{16}{35}.\frac{7}{90}\)
\(\frac{7}{90}.\left(74\frac{19}{35}+15\frac{16}{35}\right)\)
\(\frac{7}{90}.90\)
\(7\)
=74\(\frac{19}{35}\).\(\frac{7}{90}\)+15\(\frac{16}{35}\).\(\frac{7}{90}\)
=(74\(\frac{19}{35}\)+15\(\frac{16}{35}\)).\(\frac{7}{90}\)
=90.\(\frac{7}{90}\)
=7
k cho mình nhé
dung 100%
