7 : 7 + 49 x (23 x 15 - 4 x 5)
= 1 + 49 x (8 x 15 - 20)
= 1 + 49 x 100
= 149 + 1
= 150
7 : 7 + 49 x (23 x 15 - 4 x 5)
= 1 + 49 x (8 x 15 - 20)
= 1 + 49 x 100
= 149 + 1
= 150
\(7:7+49\times\left(2^3\times15-4\times5\right)\)
\(=1+49\times\left(8\times15-20\right)\)
\(=1+49\times100\)
\(=1+4900\)
\(=4901\)