\(\dfrac{12}{7}+\dfrac{8}{22}\)
Ét o ét
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a: =-7/25-8/25=-15/25=-3/5
b: =-3/4-5/7=-21/28-20/28=-41/28
\(\dfrac{7}{5}x\dfrac{2}{5}=\dfrac{14}{25}\)
\(\dfrac{3}{4}+\dfrac{5}{4}:\dfrac{1}{4}x\dfrac{1}{2}=\dfrac{3}{4}+5x\dfrac{1}{2}=\dfrac{5}{2}\)
125/90=25/18
84/91=12/13
75/45=25/15=5/3
6/7=18/21=54/63=104/126
a.\(\dfrac{7}{8}+y=5\)
\(y=5-\dfrac{7}{8}\)
\(y=\dfrac{33}{8}\)
b.\(3042\times35-9045:201\)
\(=106470-45\)
\(=106425\)
\(15-\dfrac{x}{2}=\dfrac{3}{7}\)
\(\dfrac{x}{2}=15-\dfrac{3}{7}=\dfrac{15\cdot7-3}{7}=\dfrac{102}{7}\)
\(x=\dfrac{102}{7}\cdot2=\dfrac{204}{7}\)
tick cho tao
\(\dfrac{12}{7}+\dfrac{8}{22}=\dfrac{12}{7}+\dfrac{4}{11}=\dfrac{132}{77}+\dfrac{28}{77}=\dfrac{160}{77}\)