300-(90+70)+(86-46)
90/(10*9)/(9/9)
91/13*7
84/(14*3)
Помогите плиз

1) 300-(90+70)+(86-46) =

300-160+132 = 172

2) 90/(10*9)/(9/9) =

90/90/1 = 1

3) 91/13*7 =

7*7 = 49

4) 84/(14*3) =

84/42 = 2