Question

Tính bằng cách thuận tiện nhất :

                                 36 x 950 +18 x 726 x 2 +3 x 324 x 12

                             1 + 3 + 5 + 7 + 9 + ... + 27 + 29 + 31 - 152

Answer 1

=\(\frac{36.950+36.726+36.324}{\left(29+1\right).15:2-152}\)

=\(\frac{36.\left(950+726+324\right)}{73}\)

=\(\frac{36.2000}{73}\)

=\(\frac{72000}{73}\)

Answer 2

\(\frac{36\times950+18\times726\times2+3\times324\times12}{1+3+5+7+9+....+27+29+31-152}\)

\(=\frac{36\times950+\left(18\times2\right)\times726+324\times\left(12\times3\right)}{\left(31+1\right)\times16\div2-152}\)

\(=\frac{36\times950+36\times726+324\times36}{256-152}\)

\(=\frac{36\times\left(950+726+324\right)}{104}\)

\(=\frac{36\times2000}{104}=\frac{72000}{104}=\frac{9000}{13}\)