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\(m+\left(2022+n\right)=725+\left(2022+n\right)\)
\(\Rightarrow m+2022+n=725+2022+n\)
\(\Rightarrow m+n-n=725+2022-2022\)
\(\Rightarrow m=725\)
`2022+2022:1/3+2022+2022:1/5`
`=2022+2022xx3+2022+2022xx5`
`=2022xx(1+3+1+5)`
`=2022xx10=20220`
ĐỘ DÀI ĐƯỜNG CHÉO NGẮN LÀ : 9/10 - 1/5 = 7/10 (M)
DIỆN TÍCH TẤM BÌA HÌNH THOI LÀ : 9/10 X 7/10= 56/100 = 14/25 ( M2)
ĐÁP SỐ : 14/25 M2
\(\dfrac{2022\times2023-1}{2023\times2021+2022}\)
= \(\dfrac{\left(2021+1\right)\times2023-1}{2023\times2021+2022}\)
= \(\dfrac{2023\times2021+2023-1}{2023\times2021+2022}\)
= \(\dfrac{2023\times2021+2022}{2023\times2021+2022}\)
= 1
\(\dfrac{1}{2022}\) \(\times\) \(\dfrac{2}{5}\) + \(\dfrac{1}{2022}\) \(\times\) \(\dfrac{7}{5}\) - \(\dfrac{1}{2022}\) \(\times\) \(\dfrac{8}{10}\)
= \(\dfrac{1}{2022}\) \(\times\) ( \(\dfrac{2}{5}\) + \(\dfrac{7}{5}\) - \(\dfrac{8}{10}\))
= \(\dfrac{1}{2022}\) \(\times\) ( \(\dfrac{9}{5}\) - \(\dfrac{4}{5}\))
= \(\dfrac{1}{2022}\) \(\times\) \(\dfrac{5}{5}\)
= \(\dfrac{1}{2022}\times1\)
= \(\dfrac{1}{2022}\)
( m: 1 - m 1) : ( m 2022 + m +2022)
= (m - m) : ( m 2022 + m + 2022)
= 0: ( m 2022 + m + 2022)
= 0