Toán Lớp 4: Giúp với ạ :
Tìm x :
x + $\dfrac{7}{5}$ = $\dfrac{7}{4}$
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Toán Lớp 4: Giúp với ạ :
Tìm x :
x + $\dfrac{7}{5}$ = $\dfrac{7}{4}$
Comments ( 2 )
x = $\dfrac{7}{4}$ – $\dfrac{7}{5}$ = $\dfrac{7 x 5}{4 x 5}$ – $\dfrac{7 x 4}{5 x 4}$
x = $\dfrac{35}{20}$ – $\dfrac{28}{20}$
x = $\dfrac{7}{20}$
Vậy x = $\dfrac{7}{20}$