A∩ (B ∩C) =(A ∩ B)∩ C
solve 25/4-21/4
2
∑(X
i
Y
Z
)
18.6÷16
2 ∑ ( X i Y i Z i 2 )
$\sqrt{2x}$ + 3 = 9
x^2-x+12=0
45/d-1=3
resolve x+11 /(x+3) (x-1)(x-1) into partial fraction
sin13/12 question by tronmetr method
