1). а) 5^(-2) = (1/5) ^2 = 1/25 б) 12* 3^ (-3) =12* (1/3)^3= 12* 1/27 =4/9 в) (27*3^(-2))^ (-1) = (27* 1/9)^ (-1) = 3^(-1) = 1/3 <span>г) (2^(-3))* ((2^2)/(2^(-4)))= (2^2)/(2^(-1))= 4/1/2= 8
2). a) ((x^(-3))* (x^5))/ (x^(-6)) =(x^5)/(x^(-3))= (x^5)/1/(x^3) = (x^5)*(x^3) = x^8
</span><span>б) (12y^(-7))/(3/(4y^(-5))) = ((12y^(-7))*(4y^(-5)))/3 = (4y^(-7))*(4y^(-5)) = 16y^(-12)= 16/ y^12</span>
1 целая 4/9= 13/9
3-13/9=27/9-13/9=14/9= 1 целая 5/9
A=b*c+r
a-r=b*c
(a-r)/b=c
Отсюда(подставляем значения a, b и r) c=(38-3)/7=5
1 результат
45- 9300
56- 9960
88 - 11880
2 результат
45- 570
56- 636
88- 828
(х-30)×5=365
x×5-30×5=365
5x-30×5=365
5x-150=365
5x=365+150
5x=515
x=515÷5
x=103