a) ( 42-98) – (42-12) -12
b) -217 + 88 + 117
c) -25 . 72 + 25 . 21 – 49 .25
d) (-5) . 4 .(-2) . 3 . (-25)
e) 8154 – (674 + 8154 ) + ( -98 + 674 )
f) 17. (15 – 16) + 16.(17- 20 )
a) ( 42-98) – (42-12) -12
b) -217 + 88 + 117
c) -25 . 72 + 25 . 21 – 49 .25
d) (-5) . 4 .(-2) . 3 . (-25)
e) 8154 – (674 + 8154 ) + ( -98 + 674 )
f) 17. (15 – 16) + 16.(17- 20 )
Đáp án:
a) ( 42-98) – (42-12) -12=-98
b) -217 + 88 + 117=-12
c) -25 . 72 + 25 . 21 – 49 .25=-2500
d) (-5) . 4 .(-2) . 3 . (-25)=-3000
e) 8154 – (674 + 8154 ) + ( -98 + 674 )=-98
f) 17. (15 – 16) + 16.(17- 20 )=-65
Giải thích các bước giải:
a) ( 42-98) – (42-12) -12
= -56 – 30 – 12
= -98
b) -217 + 88 + 117
= -12
c) -25 . 72 + 25 . 21 – 49 .25
= -1800 + 525 – 1225
= -2500
d) (-5) . 4 .(-2) . 3 . (-25)
= -20 . (-6) . (-25)
= – 3000
e) 8154 – (674 + 8154 ) + ( -98 + 674 )
= 8154 – 8828 + 576
= -98
f) 17. (15 – 16) + 16.(17- 20 )
= 17. (-1) + 16 . (-3)
= -17 – 48
= -65
CHÚC BẠN HỌC TỐT
CHO MIK XIN CTLHN NHA
$ ( 42-98) – (42-12) -12$
`= -56 – 30 – 12`
`= -98`
`b) -217 + 88 + 117`
= ` – 217 +117 + 88 `
`= -100 + 88 `
`= -12 `
c) `-25 . 72 + 25 . 21 – 49 .25`
= `-1800 + 525 – 1225`
`= -2500`
d) `(-5) . 4 .(-2) . 3 . (-25)`
= `-20 . (-6) . (-25)`
=` – 3000`
e`) 8154 – (674 + 8154 ) + ( -98 + 674 )`
=` 8154 – 8828 + 576`
`= -98`
`f) 17. (15 – 16) + 16.(17- 20 )`
`= 17. (-1) + 16 . (-3)`
`= -17 – 48`
`= -65`
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