Salut!
[(9²-2⁴x5):10+7¹³:(7³)⁴]x2²=
[(81-16x5):10+7¹³:7¹²]x4=
[(81-80):10+7]x4=
(1:10+7)x4=
(1/10+70/10)x4=
71/10x4=
71x2/5=
=142/5
=28,4
Succes!
