Question

2^2+9*5^2-3*4^2+5^2*7-2^3*5^2-6^2*3

Answer 1

2²+9x5²-3x4²+5²x7-2³x5²-6²x3 =
 =2²+5²(9+7-2³)-3x4²-2²x3³ =
 =2²+5²x2³-3x2⁴-2²x3³ =
 =2²+5²x2³-3x2²(2²+3²) =
 =2²+5²x2³-3x2²x13 =
 =2²(1+5²x2)-3 x2²x13) =
 =2²x51-3 x2²x13 =
  =2²(51-3x13) =
 =2²x(51-39) =
 =2²x12 =
 =2⁴x 3=48

verificare
2^2+9*5^2-3*4^2+5^2*7-2^3*5^2-6^2*3 =
=4+9*25-3*16+25*7-8*25-4*9*3 =
=4+225-48-25-108 =
=48=2⁴x3