\(5\left(x+3\right).x=109\)
\(=>5x^2+15x=109\)
\(=>5x^2+15x-109=0\)
\(5.x+3.x=109\)
\(x.\left(5+3\right)=109\)
\(x.8=109\)
\(x=\frac{109}{8}\)
b) \(189:x-37:x=8\)
\(x:\left(189-37\right)=8\)
\(x:152=8\)
\(x=8.152\)
\(x=1216\)
\(5\left(x+3\right).x=109\)
\(=>5^2+15x=109\)
\(=>5^2+15x-109=0\)
Đáp số : \(0\)
5 nhân x + 3 nhân x = 109
x nhân ( 5 + 3 ) = 109 x nhân 8 =109
x nhân 8 = 109
x = 109 : 8
x =???
\(5\left(x+3\right).x=109\)
\(=>5x^2+15x=109\)
\(=>5x^{2^{ }}+15x-109\)
\(=>0\)
