54+64
tính nhanh
a,123+54+(-123)+46 b,(-64)+(-111)+64+71
\(a,=\left(123-123\right)+\left(54+46\right)=100\\ b,=\left(-64+64\right)+\left(71-111\right)=-40\)
tính nhanh
a,123+54+(-123)+46=(123-123)+(54+46)=100
b,(-64)+(-111)+64+71=((-64)+64)+(71-111)=-40
a) 123 + [54 + (-123) + 46]
b) -64 + [(-111) + 64 + 71]
giúp mình
Lời giải:
a.
$=123+54-123+46=(123-123)+(54+46)=0+100=100$
b.
$=-64-111+64+71=(-64+64)-(111-71)=0-40=-40$
nooooooooooooooooooooooooooooooooooooooooooooooooooooo
123+|54+(-123)+46|
-64+|(-111)+64+71|
123+|54+(-123)+46|
=123+|54+46+(-123)|
=123+|100+(-123)|
=123+|-23|
=123+23=146
-64+|(-111)+64+71|
=-64+|(-111)+135|
=-64+|24|
=-64+24=-40
Chúc bạn học tốt ^^!!!
2. Tính nhanh. a) 123 + [54 + (-123) + 46]
b) -64 + [(-111) + 64 + 71]a) \(123+\left[54+\left(-123\right)+46\right]\)
\(=123+54+\left(-123\right)+46\)
\(=54+46\)
\(=100\)
b) \(-64+\left[\left(-111\right)+64+71\right]\)
\(=-64+\left(-111\right)+64+71\)
\(=\left(-111\right)+71\)
\(=-40\)
12×125×54
b.64×125×54
c.36×[143+57)+64+(143+57)
d.78×31+78×24+70×22×22×72
e.64×14+9×59
\(a.12\times125\times54\)
\(=1500\times54\)
\(=81000\)
\(b.64\times125\times54\)
\(=8000\times54\)
\(=432000\)
\(c.36\times\left[143+57\right]+64+\left(143+57\right)\)
\(=36\times200+64+200\)
\(=7200+64+200\)
\(=7264+200\)
\(=7464\)
a) =81000
b) 432000
c) 7464
d) 7414
e) 1427
cam on cac ban nhieu nhe lan sau co bai toan nho giup do minh nhe ban
Tính hợp lí
36 . 64 + 18 . 64 + 36 . 54
. = nhân
36 . 64 + 18 . 64 + 36 . 54
=(36+18)x64+36x54
=54x64+36x54
=(64+36)x54
=100x54
=5400
36. 64 + 18 . 64 + 36 . 54
= ( 36 + 18 ) . 64 + 36 . 54
= 54 . 64 + 36 . 54
= ( 54 + 36 ) . 54
= 100 .54
=5400
Tính bằng cách thuận tiện nhất:
876 × 64 - 876 × 54
876 × 64 - 876 × 54 = 876 × ( 64 - 54 ) = 876 × 10 = 8760
876 x 64 - 876 x 54
= 876 x ( 64 - 54 )
= 876 x 10
= 8760
876 x 64 - 876 x 54
= 876 x ( 64 - 54 )
= 876 x 10
= 8760
100 - 94 + 90 - 84 + 80 - 74 + 70 - 64 + 60 - 54
\(100-94+90-84+80-74+70-64+60-54\)
\(=6+6+6+6+6\)
\(=6^5=30\)
100 - 94 + 90 - 84 + 80 - 74 + 70 - 64 + 60 - 54
\(100-94+90-84+80-74+70-64+60-54\)
\(=6+6+6+6+6\)
\(=6.5=30\)