Question

1 phần 3 nhân x cộng 3 phần 4 nhân x trừ 75%=-21 phần 4

Answer 1

\(\frac{1}{3}\times x+\frac{3}{4}\times x-75\%=\frac{-21}{4}\)

Answer 2

1/3×x+3/4×x-75%=-21/4 x×(1/3+3/4)-3/4+21/4=0 x×13/12-(3/4-21/4)=0 x×13/12+9/2=0 x×13/3=-9/2 x=-9/2:13/3 x=-27/26