Tìm x
\(\displaystyle a) \;x + {3 \over 5} = {7 \over 2}\)
\(\displaystyle b)\;x - {1 \over 4} = {1 \over 5}\).
\(\displaystyle c)\;2 - x = {4 \over 7}\)
a)
\(\eqalign{ & x + {3 \over 5} = {7 \over 2} \cr & \,\,\,\,\,\,\,\,x = {7 \over 2} - {3 \over 5} \cr & \,\,\,\,\,\,\,\,x = {{29} \over {10}} \cr} \)
b)
\(\eqalign{ & x - {1 \over 4} = {1 \over 5} \cr & \,\,\,\,\,\,\,x = {1 \over 5} + {1 \over 4} \cr & \,\,\,\,\,\,\,\,x = {9 \over {20}} \cr}\)
c)
\(\eqalign{ & 2 - x = {4 \over 7} \cr & 2 - {4 \over 7} = x \cr & \,\,\,\,\,\,\,x = {{10} \over 7} \cr}\)
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