Question

Tìm x biết

a) -2x(x+3)+x(2x-1)=10

b) (2/3x)(9x/2+1/4)-(3x²x+2)=3

Answer 1

a: -2x(x+3)+x(2x-1)=10

=>-2x^2-6x+2x^2-x=10

=>-7x=10

=>x=-10/7

b: Sửa đề: 2/3x(9/2x+1/4)-(3x^2+2)=3

=>3x^2+1/6x-3x^2-2=3

=>1/6x-2=3

=>x=30