㏒₃₀(150*6)=㏒₃₀900=㏒₃₀30²=2㏒₃₀30=2.
㏒₇₈₄(1/4*1/7)=㏒₇₈₄(1/28)=㏒₂₈²(28⁻¹)=-1/2=-0,5
㏒₁₂(36*4)=㏒₁₂144=㏒₁₂12²=2㏒₁₂12=2
㏒₁/₃₀(5*6)=-㏒₃₀30=-1
..........................................
605*30:100=181,5-----------------------------------------
X+y=20
x*y=75
x=20-y
(20-y)y=75
20y-y^2=75
-y^2+20y-75=0 /-1
y^2-20y+75=0
D= 400-300=100
y1=20+10/2=15
y2=20-10/2=5
x=20-y
x1=20-15=5
x2=20-5=15
x1=5; y1=15
x2=15; y2=5
3m² * 4n²/m³ - 2m² = 12n²m²/m²(m - 2) = 12n²/m - 2
2.
a) (3c³/b⁵)² = 3²c³°²/b⁵°² = 9c⁶/b¹⁰ - 2)
б) 3с⁴/b⁹ : 1/3cb² = 3c⁴b⁹ * 3cb²/b⁹ * 1 = 9c⁵b²/b⁹ =
9c⁵b⁻⁷ = 9c⁵/b⁷ - 1)
в) 3с⁷/b¹⁰ * b³/c = 3c⁷b³/b¹⁰c = 3c⁶b⁻⁷ = 3c⁶/b⁷ - 4)