1x23 + 8x7 + 6x = 200x
Ta có :
1023 + x . 100 + 807 + x.10 + 60 + x = 200x
( 1023 + 807 + 60 ) + xxx = 2000 + x
1890 + xx . 10 = 2000
xx . 10 = 2000 - 1890 = 110
xx = 110 : 10
xx = 11
=> x = 1
Lưu ý : . là nhân nhé
1x23+8x7+6x=200x
(1023+x*100)+(807+x*10)+(60+x)=2000+x
(1023+807+60)+(x*100+x*10+x)=2000+x
1890+x*111=2000+x
1890+x*110=2000
x*110=2000-1890=110
x=110/110
=>x=1