Question

tính nhanh:

\(74\frac{19}{35}\).\(\frac{7}{90}\)+\(15\frac{16}{35}\):\(\frac{90}{7}\)

Answer 1

Ta có:

\(74\frac{19}{35}.\frac{7}{90}+15\frac{16}{35}:\frac{90}{7}\)

\(=74\frac{19}{35}.\frac{7}{90}+15\frac{16}{35}.\frac{7}{90}\)

\(=\frac{7}{90}.\left(74\frac{19}{35}+15\frac{16}{35}\right)\)

\(=\frac{7}{90}.90\)

\(=7\)

Answer 2

\(74\frac{19}{35}.\frac{7}{90}+15\frac{16}{35}.\frac{7}{90}\)

\(\frac{7}{90}.\left(74\frac{19}{35}+15\frac{16}{35}\right)\)

\(\frac{7}{90}.90\)

\(7\)

Answer 3

=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

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