a, x.(x+3)=0
b,(x+1).(x mũ 2+1)=0
c3x+4y -xy=16
d-12.(x-5)+7.(3-x)=5
e,30(x+2)-6(x-5)-24x=100
f,(x+1)+(x+3)+(x+5)+...+ x+99=0
Loga
Sinh Học lớp 12
