2 câu trả lời
`3/4 . 2^2+1/4 . (-2)^2`
`= 3/4 . 4 + 1/4 . 4`
`= 4 . ( 3/4 + 1/4 )`
`= 4 . 4/4`
`= 4 . 1`
`= 4`
$\dfrac{3}{4}\cdot \:2^2+\dfrac{1}{4}\left(-2\right)^2$
$=\dfrac{3}{4}\cdot \:4+\dfrac{1}{4}\left(-2\right)^2$
$=\dfrac{3}{4}\cdot \:4+\dfrac{1}{4}\cdot \:4$
$=3+\dfrac{1}{4}\cdot \:4$
$=3+1$
$=4$
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