Question

Answer 1

`1 1/4 xx 5/7 + 1 1/4 xx 3/7 - 1 1/4 xx 1/7`

`=1 1/4 xx (5/7+3/7-1/7)`

`=1 1/4 xx (8/7-1/7)`

`=1 1/4 xx 7/7`

`=1 1/4 xx 1`

`=5/4`

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`2 2/5 xx 1 3/4 - 12/5 xx 1/4 - 2 2/5 xx 1/2`

`=12/5 xx 7/4 - 12/5 xx 1/4 - 12/5 xx 1/2`

`=12/5 xx (7/4-1/4-1/2)`

`=12/5 xx (6/4-1/2)`

`=12/5 xx (3/2-1/2)`

`=12/5 xx 2/2`

`=12/5 xx 1`

`=12/5`

Answer 2

a: \(=\dfrac{5}{4}\left(\dfrac{5}{7}+\dfrac{3}{7}-\dfrac{1}{7}\right)=\dfrac{5.}{4}\)

b: \(=\dfrac{12}{5}\left(\dfrac{7}{4}-\dfrac{1}{4}-\dfrac{1}{2}\right)=\dfrac{12}{5}\cdot1=\dfrac{12}{5}\)