Thực hiện phép tính: ${a,}$ $\dfrac{3}{4}$ ${+}$ $\dfrac{1}{2}$ ${+}$ $\dfrac{-3}{32};$ ${b,}$ $\dfrac{-5}{7}$ ${-}$ $\dfrac{3}{8}$ ${+}$ $\dfrac{1}{28};$

2 câu trả lời

`a)` $\dfrac{3}{4}$ `+` $\dfrac{1}{2}$ `+` $\dfrac{-3}{32}$

`=` $\dfrac{24}{32}$ `+` $\dfrac{16}{32}$ `+` $\dfrac{-3}{32}$

`=` $\dfrac{37}{32}$

`b)` $\dfrac{-5}{7}$ `-` $\dfrac{3}{8}$ `+` $\dfrac{1}{28}$

`=` $\dfrac{-40}{56}$ `-` $\dfrac{21}{56}$ `+` $\dfrac{2}{56}$

`=` $\dfrac{-59}{56}$

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Đáp án:

Giải thích các bước giải:

`a) 3/4 + 1/2 + (-3)/32 `

`= 24/32 + 16/32 + (-3)/32`

`= (24+16+(-3))/32`

`= 37/32`

`b) (-5)/7 - 3/8 + 1/28`

`= (-40)/56 - 21/56 + 2/56`

`= (-40-21+2)/56`

`= (-59)/56`