Question

tìm số nguyên x , biết:

a,\(\frac{x}{5}=\frac{x+6}{15}\)

b.\(\frac{x+10}{27}=\frac{x}{9}\)

c,\(\frac{x+16}{35}=\frac{x}{7}\)

Answer 1

a) Ta có: \(\frac{x}{5}=\frac{x+6}{15}\Rightarrow15x=5\left(x+6\right)\)

                                         \(\Rightarrow15x=5x+30\)

                                         \(\Rightarrow10x=30\)

                                          => x        = 3

Vậy x = 3

b) \(\frac{x+10}{27}=\frac{x}{9}\Rightarrow9\left(x+10\right)=27x\)

                                \(\Rightarrow9x+90=27x\)

                                 \(\Rightarrow18x=90\)

                                  => x      = 5

Vậy x = 5

c) \(\frac{x+16}{35}=\frac{x}{7}\Rightarrow7\left(x+16\right)=35x\)

                                   \(\Rightarrow7x+112=35x\)

                                    \(\Rightarrow28x=112\)

                                    =>x = 4

Vậy x = 4

NĂM MỚI AN LÀNH

Answer 2

ai làm nhanh mk sẽ cho và tặng quà nha nhớ để lại địa chỉ qua tết mk sẽ gửi

Answer 3

cho 1 h nha

Answer 4

a) \(\frac{x}{5}=\frac{x+6}{15}\)

\(\Rightarrow15.x=5.\left(x+6\right)\)

\(\Rightarrow15.x=5.x+30\)

\(\Rightarrow15.x-5.x=30\)

\(\Rightarrow10.x=30\)

\(\Rightarrow x=30\div10\)

\(\Rightarrow x=3\)

b) \(\frac{x+10}{27}=\frac{x}{9}\)

\(\Rightarrow27.x=9.\left(x+10\right)\)

\(\Rightarrow27.x=9.x+90\)

\(\Rightarrow27.x-9.x=90\)

\(\Rightarrow18.x=90\)

\(\Rightarrow x=90\div18\)

\(\Rightarrow x=5\)

c) \(\frac{x+16}{35}=\frac{x}{7}\)

\(\Rightarrow35.x=7.\left(x+16\right)\)

\(\Rightarrow35.x=7.x+112\)

\(\Rightarrow35.x-7.x=112\)

\(\Rightarrow28.x=112\)

\(\Rightarrow x=112\div28\)

\(\Rightarrow x=4\)

Answer 5

thank bạn để laị địa chỉ cho mk

Answer 6

\(\frac{x}{5}=\frac{x+6}{15}\)

\(x.15=\left(x+6\right)5\)

\(x.15=x.5+30\)

\(20x=30\)

\(x=30:20\)

\(x=\frac{30}{20}=\frac{3}{2}\)

Answer 7

\(\frac{x+10}{27}=\frac{x}{9}\)

\(\left(x+10\right).9=27x\)

\(9x+90=27x\)

\(90=18x\)

\(x=\frac{90}{18}\)

\(x=5\)