Câu hỏi của Tâm Phương

Question

Làm hộ em vs ạ em đg cần gấp

Nguyễn Lê Phước Thịnh · Accepted Answer

a: $2x+\frac12x=1\frac14$

=>$\frac52x=\frac54$

=>$x=\frac54:\frac52=\frac54\cdot\frac25=\frac24=\frac12$

b: $\frac12x+\frac13=2x-\frac15$

=>$\frac12x-2x=-\frac15-\frac13$

=>$-\frac32x=-\frac{8}{15}$

=>$x=\frac{8}{15}:\frac32=\frac{8}{15}\cdot\frac23=\frac{16}{45}$

c: $\left(\frac12x+\frac13\right)-\left(\frac14-\frac15x\right)=-1\frac15$

=>$\frac12x+\frac13-\frac14+\frac15x=-\frac65$

=>$\frac{7}{10}x=-\frac65-\frac13+\frac14=\frac{-72}{60}-\frac{20}{60}+\frac{15}{60}=\frac{-77}{60}$

=>$x=-\frac{11}{6}$

d: $\left(\frac12-\frac13x\right)+\left(-\frac14x+\frac12\right)-\left(1\frac13+\frac{-1}{4}x\right)=5$

=>$-\frac13x+\frac12-\frac14x+\frac12-\frac43+\frac14x=5$

=>$-\frac13x-\frac13=5$

=>$-\frac13x=5+\frac13=\frac{16}{3}$

=>x=-16

e: $\left(\frac12\left|x\right|+\frac13\right)\left(\frac14-\frac13x\right)=0$

=>$\frac14-\frac13x=0$

=>$\frac13x=\frac14$

=>$x=\frac14:\frac13=\frac34$

f: $\frac12x^2-\frac13x=0$

=>$x\left(\frac12x-\frac13\right)=0$

=>$\left[\begin{array}{l}x=0\ \frac12x-\frac13=0\end{array}\right.\Rightarrow\left[\begin{array}{l}x=0\ \frac12x=\frac13\end{array}\right.\Rightarrow\left[\begin{array}{l}x=0\ x=\frac23\end{array}\right.$

g: $\frac23x^3+\frac14x=0$

=>$x\left(\frac23x^2+\frac14\right)=0$

=>x=0

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