Toán Lớp 6: giúp em với:<
-115 + 47 + 15 -7
(112 – 83) – (12 – 33)
4.(–5)^2 + 2.(–5) – 2
34.(15 –10) – 15.(34 –10)
ac giúp em với
em cám ơn nhiều<3
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Toán Lớp 6: giúp em với:<
-115 + 47 + 15 -7
(112 – 83) – (12 – 33)
4.(–5)^2 + 2.(–5) – 2
34.(15 –10) – 15.(34 –10)
ac giúp em với
em cám ơn nhiều<3
Comments ( 2 )
Giải đáp:
-115 + 47 + 15 – 7
= [(-115) + 15] + (47 – 7)
= (-100) + 40
= -60
_____________
(112 – 83) – (12 – 33)
= 112 – 83 – 12 + 33
= (112 – 12) + [(-83) + 33]
= 100 + (-50)
= 50
_____________
4.(-5)^2 + 2.(-5) – 2
= 4 . 25 + (-10) – 2
= 100 + (-10) – 2
= 90 – 2
= 88
___________
34.(15 – 10) – 15.(34 – 10)
= 34.15 – 34.10 – 15.34 + 15.10
= (34.15 – 15.34) + 10.(-34 + 15)
= 0 + 10.(-19)
= -190
$#dariana$
a) -115 + 47 + 15 – 7
= (-115 + 15) + (47 – 7)
= -100 + 40
= -60
b) (112 – 83) – (12 – 33)
= 112 – 83 – 12 + 33
= (112 – 12) – (83 – 33)
= 100 – 50
= 50
c) 4 . (-5)^2 + 2 . (-5) – 2
= 4 . 25 + (-10) – 2
= 100 + (-10) – 2
= 90 – 2
= 88
d) 34 . (15 – 10) – 15 . (34 – 10)
= 34 . 15 – 34 . 10 – 15 . 34 + 15 . 10
= (34 . 15 – 15 . 34) – (34 . 10 – 15 . 10)
= 0 – [(34 -15).10]
= 0 – [19 . 10]
= 0 – 190
= -190