3 1/8 : ((4 5/12 - 3 13/24) * 4/7 + (3 1/18 - 2 7/12) * 1 10/17) = 2 1/2
1) 4 5/12 - 3 13/24 = 4 10/24 - 3 13/24 = 3 34/24 - 3 13/24 = 21/24 = 7/8
2) 7/8 * 4/7 = 4/8 = 1/2
3) 3 1/18 - 2 7/12 = 3 2/36 - 2 21/36 = 2 38/36 - 2 21/36 = 17/36
4) 17/36 * 1 10/17 = 17/36 * 27/17 = 27/36 = 3/4
5) 1/2 + 3/4 = 2/4 + 3/4 = 5/4 = 1 1/4
6) 3 1/8 : 1 1/4 = 25/8 : 5/4 = 25/8 * 4/5 = 5/2 = 2 1/2
(ПРОВЕРЕННО)
Сложно но можно щас подожди
3^n+1 - 3^n/15^n+1*(3^-n/5^n)^-1=
3^n+1 - 3^n/15^n+1 * 5^n/3^-n=
3^n+1 - 3^n*5^n*3^n/15^n+1=
3^n(3-1) * 15^n/15^n*15=
3^*2/15
1)1-100x=0. , -100х=-1, 100х=1, х= 1/100, х =0,01
2)8c+0,73=4,61-8c. , 8с+8с=4,61-0,73, 16с=3,88, с = 3,88 / 16, с = 0,2425
3)(8x+11)-13=9x-5, 8х-9х=-5-11+13 -х=-3, х =3
Кв.корень(x+7)=7
(кв.корень(x+7))^2=7^2
x+7=49
x=42
кв.корень(6x-1)=1
(кв.корень(6x-1))^2=1^2
6x-1=1
6x=2
x=1/3