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\(\dfrac{9}{16}-\dfrac{3}{8}=\dfrac{9}{16}-\dfrac{6}{16}=\dfrac{3}{16}\)
\(\dfrac{9}{16}:\dfrac{3}{8}=\dfrac{9}{16}\cdot\dfrac{8}{3}=\dfrac{1}{2}\cdot3=\dfrac{3}{2}\)
\(a,=\dfrac{17}{12}\\ b,=\dfrac{3}{16}\\ c,=\dfrac{35}{72}\\ d,=\dfrac{3}{2}\)
b) \(\dfrac{9}{16}-\dfrac{3}{16}:\dfrac{3}{8}=\dfrac{9}{16}-\dfrac{3}{16}\times\dfrac{8}{3}=\dfrac{9}{16}-\dfrac{24}{48}=\dfrac{9}{16}-\dfrac{1}{2}=\dfrac{9}{16}-\dfrac{8}{16}=\dfrac{1}{16}\)
`39/16 : 5/8 - 7/16 : 5/8`
`=39/16 xx 8/5- 7/16 xx 8/5`
`=8/5 xx (39/16 - 7/16)`
`= 8/5 xx2`
`= 16/5`
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` 4/3 xx 9/8 - 4/3 xx 3/8`
`=4/3 -(9/8 - 3/8)`
`= 4/3 xx 3/4`
`=1`
\(a,\\ \dfrac{39}{16}:\dfrac{5}{8}-\dfrac{7}{16}:\dfrac{5}{8}\\ =\dfrac{39}{16}\cdot\dfrac{8}{5}-\dfrac{7}{16}\cdot\dfrac{8}{5}\\ =\dfrac{8}{5}\cdot\left(\dfrac{39}{16}-\dfrac{7}{16}\right)=\dfrac{8}{5}\cdot2=\dfrac{16}{5}\\ b,\\ \dfrac{4}{3}\cdot\dfrac{9}{8}-\dfrac{4}{3}\cdot\dfrac{3}{8}=\dfrac{3}{2}-\dfrac{1}{2}=1\)
3/8 + 9/2 x 3/4 - 9/4 x 1/3
= 3/8 + 9/2 x 3/4 - 3/4
= 3/8 + (9/2 - 1) x 3/4
= 3/8 + 7/2 x 3/4
= 3/4 x 1/2 + 7/2 x 3/4
= 3/4 x ( 1/2 + 7/2 )
= 3/4 x 4
= 3
3/8 + 9/2 x 3/4 - 9/4 x 1/3
= 3/8 + 9/2 x 3/4 - 3/4
= 3/8 + (9/2 - 1) x 3/4
= 3/4 x 1/2 + 7/2 x 3/4
= 3/4 x ( 1/2 + 7/2)
= 3/4 x 4
= 3
Bài 1: Tính
\(a.\frac{15}{16}-\frac{7}{16}=\frac{15-7}{16}=\frac{8}{16}=\frac{1}{2}\)
\(b.\frac{7}{4}-\frac{3}{4}=\frac{7-3}{4}=\frac{4}{4}=1\)
\(c.\frac{9}{5}-\frac{3}{5}=\frac{9-3}{5}=\frac{6}{5}\)
\(d.\frac{17}{49}-\frac{12}{49}=\frac{17-12}{49}=\frac{5}{49}\)
Bài 2:Rút gọn rồi tính
\(a.\frac{2}{3}-\frac{3}{9}=\frac{2}{3}-\frac{1}{3}=\frac{2-1}{3}=\frac{1}{3}\)
\(b.\frac{7}{5}-\frac{15}{25}=\frac{7}{5}-\frac{3}{5}=\frac{7-3}{5}=\frac{4}{5}\)
Học tốt. K cho mik nha
\(\dfrac{9}{16}-\dfrac{3}{16}:\dfrac{3}{8}\) \(=\dfrac{9}{16}-\dfrac{3}{16}\cdot\dfrac{8}{3}\) \(=\dfrac{9}{16}-\dfrac{1}{2}\) \(=\dfrac{9}{16}-\dfrac{8}{16}=\dfrac{1}{16}\)
Bá Hoàng: Tất cả các phân số trên đó đã được tối giản rồi mà :)