(9х²*х∧-8)÷(х∧-15*5х∧9)=
1) 9х²*х∧-8=9х∧-6 когда умножаем степени (+ ) 2+(-8)=-6
2) х∧-15*5х∧= 5х∧-10 -15+5=-10
3) 9х∧-6÷ 5х∧-10=9/5х∧4 когда делим степени (-) -6-(-10)=4
1) -15,92
2)40,8
3)-3,441
4)144,03
12kz-4k2-6z2+2kz=-4k2+14kz-6z2
1)
A) 16/(x-4) -x²/(x-4) =(16-x²)/(x-4) = -(x² -16)/(x-4) =-(x-4)(x+4)/(x-4) =-(x+4) = - x -4 → (3).
Б) x²/(4-x) +16/(x-4) =x²/-(x-4) +16/(x-4) = 16/(x-4) -x²/(x-4) ⇔A) → (3).
В) x²/(x+4) -16/(4+x) = (x²-16)/(x+4) =(x-4)(x+4)/(x+4) =x - 4 → (1).
Г) 16/(x+4) -x²/(4+x) =(16 -x²)/(4+x) =(4-x)(4+x)/(4+x) =4-x → (5).
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m² /(4n-4m) -n²/(4n - 4m) =(m² -n²)/(4n -4m) =(m-n)(m+n)/4(n-m) = - (n -m)(m+n)/4(n-m) =
-(m+n)/4.
3) (6a⁵ - 5b²)/(7ab³) = 6a⁵/7ab³ -5b²/7ab³ =6a⁴/7b³ -5/7ab.