А в 25 степени : а в 9 степени = а в 16 степени
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
1)√49/100×25=7/10×25=7/2×5=35/2=17 1/2
2)5^3×4=125×4=500
3)3√2√2√9=3×2×3=18
<span>ln x^2 = 0
</span>ln x^2 = <span>ln1
</span><span>x^2 =1
</span>x=+1;-1
<span>log3 3^x =4
</span>log3 3^x = <span>log3 81
</span><span>3^x-81
</span>x=4
<span>log5 (2x-x^2)=0
</span>log5 (2x-x^2)=<span>log5 1
</span>2x-<span>x^2=1
</span><span>x^2-2x+1=0
</span>x=1
ну вроде так