Tìm \(\displaystyle x\) :
a) \(\displaystyle x+{1 \over 3} = {4 \over 5}\)
b) \(\displaystyle x-{1 \over 2}={2 \over 7}\)
a) \(\displaystyle x+{1 \over 3}={4 \over 5}\)
\(\displaystyle x={4 \over 5}-{1 \over 3}\)
\(\displaystyle x={7 \over {15}}\)
b) \(\displaystyle x-{1 \over 2}={2 \over 7}\)
\(\displaystyle x={2 \over 7}+{1 \over 2}\)
\(\displaystyle x={{11} \over {14}}\)
-- Mod Toán lớp 4