Câu $1$.
$a$) $(42-98)-(42 - 12) - 12$
$= 42 - 98 - 42 + 12 - 12$
$= (42 - 42) + (12-12) - 98$
$= -98$.
$b$) $(-5).4.(-2).3.(-25)$
$= (-5).(-2).4.(-25).3$
$= 10.(-100).3$
$= (-3000)$.
Đáp án + Giải thích các bước giải :
a) (42−98) − (42−12) − 12
= 42 − 98 − 42 + 12 − 12
= (42−42) + (12−12) − 98
= −98
b) (−5).4.(−2).3.(−25)
=(−5) . (−2) . 4 . (−25) . 3
=10 . (−100) . 3 = 10.(−100) . 3
=(−3000)
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