Решите уравнения*
х + 2х + ... + 10х = 5500
х + 2х + ... + 20х = 2100
х + 3х + 5х + ... + 15х = 640
х + 3х + 5х + ... + 15х = - 640
х + 2х + ... + 10х = 5500
х + 2х + ... + 20х = 2100
х + 3х + 5х + ... + 15х = 640
х + 3х + 5х + ... + 15х = - 640
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Х*55=5500
Х=5500:55
Х=100
Х*(1+2+3+...+20) = 2100
Х*210 = 2100
Х=2100:210
Х=10
Х*(1+3+5+....+15)=640
Х*64= 640
Х=640:64
Х=10
Х*(1+3+5+....+15)=- 640
Х*64= - 640
Х= -640:64
Х= - 10