Question

tìm x : 25-(x+1.85):3=7

tìm a : 100.5<a8+8a<110.5

Answer 1

a8+8a <--chỗ này là thế nào đây

Answer 2

đề sai à x+1*85 thì vít lun x+85 đi

Answer 3

\(25-\left(x+1\cdot85\right):3 =7\)

\(25-\frac{x}{3}+\frac{85}{3}=7\)

\(25-\left(\frac{x}{3}-\frac{85}{3}\right)=7\)

\(25-\frac{x-85}{3}=7\)

\(\frac{x-85}{3}=18\)

\(x-85=54\)

\(x=139\)

Answer 4

\(100\cdot5< a8+8a< 110\cdot5\)

\(500< 2\cdot8\cdot a< 550\)

\(500< 16a< 550\)

\(16a\in\left\{501;502;503;...449\right\}\)

\(a\in\left\{\frac{501}{16};\frac{502}{16};\frac{503}{16};....\frac{449}{16}\right\}\)