Tìm x,y biết:
1) 6x(x-4)+2x(5-3x)=10
2) x(2x+5)+(x+1)(3-2x)=7
3) (x-3)(2x+5)-2x(x-1)=-3
4) (x+2)(x-3)-(x+1)(x-7)=1
5) ($3x+1)^{2}$+(2-x)(9x+1)=10
6) (x-4)(4x+3)- ($2x-1)^{2}$=5
7) ( ($2x-3)^{2}$ -4($x-2)^{2}$ =-4
Loga
Sinh Học lớp 12
