\(C_1\): \(\left(\dfrac{1}{3}+\dfrac{1}{5}\right)\times\dfrac{1}{4}=\dfrac{8}{15}\times\dfrac{1}{4}=\dfrac{2}{15}\)
\(C_2:\left(\dfrac{1}{3}+\dfrac{1}{5}\right)\times\dfrac{1}{4}=\dfrac{1}{4}\times\dfrac{1}{5}+\dfrac{1}{4}\times\dfrac{1}{3}=\dfrac{2}{15}\)
\(C_1:\)
\(=\dfrac{8}{15}\times\dfrac{1}{4}=\dfrac{2}{15}\)
\(C_2:\)
\(=\dfrac{1}{3}\times\dfrac{1}{4}+\dfrac{1}{5}\times\dfrac{1}{4}=\dfrac{1}{12}+\dfrac{1}{20}=\dfrac{8}{60}=\dfrac{2}{15}\)
c1) 8/15 x 1/4
= 2/15
c2) 1/3 + 1/5 x 1/4
= 1/3 + 1/20
= 23/60
nhầm nhầm
định gửi ảnh cho con bn chép,sr nha
