Đáp án:
`g. \frac{45xx16-17}{45xx15+28}`
`= \frac{45xx16-\frac{17}{45}xx45}{45xx15+\frac{28}{45}xx45}`
`= \frac{45(16-\frac{17}{45})}{45(15+\frac{28}{45})}`
`= \frac{16-\frac{17}{45}}{15+\frac{28}{45}}`
`= \frac{16-\frac{17}{45}}{\frac{703}{45}}`
`= \frac{\frac{703}{45}}{\frac{703}{45}}`
`= 1`
`h. 253xx75-161xx37+253xx25-161xx63`
`= (253xx75+253xx25)-(161xx37+161xx63)`
`= 253xx(75+25)-161xx(37+63)`
`= 253xx100-161xx100`
`= 100xx(253-161)`
`= 100xx92`
`= 9200`
