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\(\frac{3}{4}+\frac{1}{3}\times a=\frac{7}{6}\)
\(\Leftrightarrow\frac{1}{3}\times a=\frac{7}{6}-\frac{3}{4}=\frac{5}{12}\)
\(\Leftrightarrow a=\frac{5}{12}\div\frac{1}{3}=\frac{5}{4}\).
\(a-\frac{1}{4}=\frac{5}{4}-\frac{1}{4}=1\)
\(\frac{3}{34}+\frac{34}{34}.\frac{3}{4}=\frac{3}{34}+1.\frac{3}{4}=\frac{3}{34}+\frac{3}{4}=\frac{57}{68}\)
\(\frac{23}{3}.\frac{56}{6}+\frac{86}{78}=\frac{23}{3}.\frac{28}{3}+\frac{43}{39}=\frac{644}{9}+\frac{28}{3}=\frac{728}{9}\)
\(\frac{3}{45}:\frac{1}{4}=\frac{1}{15}.4=\frac{4}{15}\)
\(\frac{5}{34}-\frac{3}{6}=\frac{5}{34}-\frac{1}{2}=\frac{3}{4}\)
answer : 287
integrater his light Nguyễn Quốc Thịnh
Mình nói Tiếng Anh
\(\frac{56-x}{34}=\frac{144}{96}\)
\(=\frac{56-x}{34}=\frac{3}{2}\)
\(=\frac{56-x}{34}=\frac{51}{34}\)
\(\Rightarrow56-x=51\)
\(=-x=51-56\)
\(\Rightarrow x=5\)
\(\frac{\frac{5}{7}+\frac{6}{11}+\frac{7}{13}}{\frac{10}{7}+\frac{12}{11}+\frac{14}{13}}\)
\(=\frac{\frac{5}{7}+\frac{6}{11}+\frac{7}{13}}{2\left(\frac{5}{7}+\frac{6}{11}+\frac{7}{13}\right)}\)
\(=\frac{1}{2}\)
\(\frac{7}{18}\)+ \(\frac{5}{3}\)* 1\(\frac{3}{9}\): \(\frac{55}{4}\)
Mọi người giúp mình giải nhé!!!
\(\frac{7}{18}+\frac{5}{3}\times1\frac{3}{9}\div\frac{55}{4}=\)\(\frac{7}{18}+\frac{5}{3}\times\frac{12}{9}\div\frac{55}{4}=\)\(\frac{7}{18}+\frac{5}{3}\times\frac{12}{9}\times\frac{4}{55}=\)\(\frac{7}{18}+\frac{5\times12\times4}{3\times9\times55}=\)\(\frac{7}{18}+\frac{4\times4}{9\times11}=\)\(\frac{7}{18}+\frac{16}{99}=\)\(\frac{693}{1782}+\frac{288}{1782}=\)\(\frac{981}{1782}=\frac{109}{198}\)
SSH = ( 40 - 1 ) : 3 + 1 = 14 số
Tổng = ( 40 + 1 ) x 14 : 2 = 287
40÷2=20 vậy 20thif là số chẵn
Như vậy (1+40)×2=82