Разложите на множители 1. 25-9а^ 2. 36м^-100n^ 3. 0.04p^-1.69q^ 4/ x^y^- 4/9

1. 25-9а²=5²-(3a)²=(5-3a)(5+3a)
2. 36m²-100n²=(6m)²-(10n)²= (6m-10n)(6m+10n)
3. 0.04p²-1.69q²=(0.2p)²-(1.3q)²=(0.2p-1.3q)(0.2p+1.3q)
4. x²y²- 4/9 =(xy)²- =(xy- )(xy+)