a) 34,25 - 78,43 b) 65,19 + (-81,14) c) (-2,25) + 7,63 d) (-81,2) + (-17,7) e) (-2,71) - (-27,3) f) (-98,2) +3,51
2 câu trả lời
`a) 34,25 – 78,43`
`= 34,25 + (–78,43)`
`= –(78,43 – 34,25)`
`= – 44,18`
`b) 65,19 + (–81,14)`
`= –(81,14 – 65,19)`
`= –15,95`
`c) (–2,25) + 7,63`
`= 7,63 – 2,25`
`= 5,38`
`d) (–81,2) + (–17,5)`
`= –(81,2 + 17,5)`
`= –98,7`
e) (–2,71) – (–27,3)
`= –2,71 + 27,3`
`= 27,3 –2,71`
`= 24,59`
f) (–98,2) + 3,51
`= –(98,2 – 3,51)`
`= –94,69.`
Đáp án:
$a) 34,25-78,43$
$= 34,25+(-78,43)$
$= -44,18$
$b) 65,19+(-81,14)$
$= 65,19-81,14$
$= -15,95$
$c) (-2,25)+7,63$
$= 7,63-2,25$
$= 5,38$
$d) (-81,2)+(-17,7)$
$= -(81,2+17,7)$
$= -98,9$
$e) (-2,71)-(-27,3)$
$= (-2,71)+27,3$
$= 27,3-2,71$
$= 24,59$
$f) (-98,2)+3,51$
$= -(98,2-3,51)$
$= - 94,69$
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