X-y (√x+√y)(√x-√y)
-------------- = -------------------- = √x-√y
x1/2+y1/2 √x+√y
2/3y+48+2 1/7y-51=14/21y-3+2 3/21y=2 17/21y-3
1)234,2)625,3)56 надеюсь правильно
50=2,3^t/10
2,3^t=50*10
2,3^t=500
log₂,₃2,3^t=log₂,₃500
t*log₂,₃2,3=log₂,₃500
t=log₂,₃500
t=log₁₀500/log₁₀2,3. t= lg500/lg2,3
t=7,46133