Question

a ( x - 5 ) . ( 2 . x - 10 ) = 0

b ( x + 1 ) + ( x + 2 ) + ( x + 3 ) + .... + ( x + 100 ) = 205550

Answer 1

A) x.(10-5)= 0 : 2

x.5=0

x=0 : 5

x=0

B) x.101 + (1+2+3+.......+100)=205550

x.101+2525=205550

X.101 = 203025

X = 203025 : 101

Answer 2

a) (x-5).(2x-10)=0

TH1:x-5=0   x=5

TH2:2x-10=0   2x=10   x=5

b)(x+x+...+x) + (1+2+3+4+...+100)=205550

100x + (1+100)+(2+99)+(3+98)+....=205550

100x + 101.50 = 205550

100x + 5050 = 205550

100x = 200500

x=2005

Cho mình 1 k nha!