Log 5x=log 5 9+log 5 4; log 5 x=log 5(9×4); log 5x=log5 36
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X²=z z²-8z-9=0 z1=9 z2=-1 по т. Виета. z2<0 не подходит.
x²=9 x1=3 x2= -3
<span>1)2ab; = 2*a*b
2)2xy; =2*x*y
3)4ab;= 2 * (2a)*b
4)6xy;= 2* (3x)*y
5)3mn;= 2* (3/2m)*n
6)5xy;=2 * (x) * (5/2 y)
7)ab^2;= 2 * (a/2) * b^2
8)x^2 y;=2 *(x^2/2) * y
9)1/2a^3b;= 2 * (1/2a^3) * (1/2b)
10)1/4ab^3.= 2*(1/8a)* b^3</span>