2c+5d-c+4d=c+9b
c=0.4 d=5.4= 5.8
2) a-b=0.12-1.28= 1.16
3) 2x+18y=-9+0.45
4) 8c-b=-2-21/2
Формулы :
loga b -loga c=loga b/c
loga b+loga c=loga b*c
1/logb a=loga b
loga^n (b^n) =loga b
Решение :
log2 x-log2 3 +log2 3 +2=6
log2 ((x/3)*3)=6-2
log2 x =4
x=16
1)(у+4)^2
2)(m-7)^2
3)(c-10)^2