Răspuns :
425:5²-7 la25x49 la15:7 la54=
425:25-7 la25x(7²)la15:7 la54=
17-7 la25x7 la30:7 la54=17-7 la55:7la54-=17-7=10
425:25-7 la25x(7²)la15:7 la54=
17-7 la25x7 la30:7 la54=17-7 la55:7la54-=17-7=10