1b

2a

3b

-Tham khảo go on with

4c

5b

6a

7c

8a

9 c

10a

11d

12b

#♪◈₰♣

\(Đk:\) \(x\ne1,x\ne2,x\ne3\)

\(\Rightarrow\dfrac{x+4}{\left(x-2\right)\left(x-1\right)}+\dfrac{x+1}{\left(x-3\right)\left(x-1\right)}=\dfrac{2x+5}{\left(x-3\right)\left(x-1\right)}\)

\(\Rightarrow\dfrac{\left(x+4\right)\cdot\left(x-3\right)+\left(x+1\right)\left(x-2\right)}{\left(x-2\right)\left(x-1\right)\left(x-3\right)}=\dfrac{\left(2x+5\right)\left(x-2\right)}{\left(x-3\right)\left(x-1\right)\left(x-2\right)}\)

\(\Rightarrow x^2-3x+4x-12+x^2-2x+x-2=2x^2-4x+5x-10\)

\(\Rightarrow0x-14=x-10\)

\(\Rightarrow x=-4\left(tmđk\right)\)

\(a)C_6H_6 + 3Cl_2 \to C_6H_6Cl_6\\ n_{Cl_2}= \dfrac{2,24}{22,4} = 0,1(mol)\\ n_{C_6H_6} = \dfrac{1}{3}n_{Cl_2} = \dfrac{0,1}{3}(mol)\\ m_{C_6H_6} = \dfrac{0,1}{3}.78 = 26(gam)\\ b) n_{C_6H_6Cl_6} = n_{C_6H_6} = \dfrac{0,1}{3}(mol)\\ m_{C_6H_6Cl_6} = \dfrac{0,1}{3}.291 = 97(gam)\)

um

Bruh.