5*(p-10)=5p-50. Ответ: 5p-50.
10 × √0.25 + 1 ÷ 26 × √169 =10*0,5 + 1÷ 26 × 13 = 5+ 1/2 = 5,5
5(12-х)-11(4х-5)=9(9-5х)-26
60-5х-44х+55=81-45х-26
-5х-44х+45х=81-26-60-55
-4х=-60
х=15
1) 1997 3/5 - 1996 1/6 = 1997 18/30 - 1996 5/30 = 1 13/30
2) 1 13/30 * 1 1/29 = 43/30 * 30/29 = 43/29 = 1 14/29
B₄-b₁=b₁*q³-b₁=b₁(q³-1)=b₁(q-1)(q²+q+1)=52
b₁+b₂+b₃=b₁(1+q+q²)=26
q-1=2 q=3
b₁=52/(q³-1)=2
S₆=2*(3⁶-1)/(3-1)=728
ответ S₆=728