\(2^{18}:2^{15}+3^2.2^3-7\\ =2^{18-15}+3^2.2^3-7\\ =2^3-3^2.2^3-7\\ =2^3.\left(1-3^2\right)-7\\ =2^3.\left(1-9\right)-7\\ =8.\left(-8\right)-7=-64-7=-71\)
\(2^{18}:2^{15}+3^2\cdot2^3-7\\ =2^3+9\cdot8-7\\ =8+72-7\\ =73\)
dễ ợt
2^18/ 2^15+3^2. 2^3-7
= 2^3 +9.8-7
=8+72-7
=80-7
=73
218:215+32.23-7
= 23 + 9 . 8 - 7
= 8 + 72 - 7
= 80 - 7 = 63
