M/(m-n)-m/(m+n)=m(m+n-m+n)/(m^2-n^2)=2mn/(m^2-n^2)
2mn/(m^2-n^2) : 16m^3n/(m^2-n^2)=2mn/16m^3n=1/8m^2
<span>5а²-20а=</span>5a(a-4)
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1) (y+2)*(y-6)+(y+3)*(y-4)=4y-5
2)(z-3)*(3z+1)-(2z+3)*(4²-1)=6z+16
3) (2a-3B) *(7a +4B)-(3,5a+B) (4a-6B) =14,5a+6
4) =5n8
1/5=5⁻¹
(1/5)²⁻³ˣ= 5²
5³ˣ⁻² = 5²
3х-2=2
3х=4
х=4/3