Tính: -5,09 + 2,65
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 3,26 - 1, 549 = 1,711
b) 0,167 - 2, 396 = -2,229
c) -3,29 - 0,867 = -4,157
d) -5,09 + 2, 65 = -2.44
a, \(3,26-1,549=1,711\)
b, \(0,679-2,396=-1,717\)
c, \(-3,29-0,867=-4,157\)
d, \(-5,09+2,65=-2,44\)
![](https://rs.olm.vn/images/avt/0.png?1311)
#Trl :
\(145,5\times5,09-5,09\times33,5-12\times5,09\)
\(=5,09\times\left(145,5-33,5-12\right)\)
\(=5,09\times100\)
\(=509\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 45,5 x 21 + 54,5 x 21
= 21 x (45,5 + 54,5)
= 21 x 100
= 2100
b) 145,5 x 5,09 - 33,5 x 5,09 - 12 x 5,09
= 5,09 x (145,5 - 33,5 - 12)
= 5,09 x 100
= 509
a)45,5x21+54,5x21
=21x(45,5+54,5)
=21x100
=2100
b)154,5 x 5,09 - 33,5 x 5,09 -12 x 5,09
=5,09 x(154,5 - 33,5 - 12)
=5,09 x 100
=509
![](https://rs.olm.vn/images/avt/0.png?1311)
45,5 * 21+54,5 *21=(45,5+54,5)*21=100*21=2100
145,5*5,09-33,5*5,09-12*5,09=(145,5-33,5-12)*5,09=100*5,09=509
![](https://rs.olm.vn/images/avt/0.png?1311)
\(145,5\cdot5,09-33,5\cdot5,09-12\cdot5,09\)
\(=5,09\cdot\left(145,5-33,5-12\right)\)
\(=5,09\cdot100\)
\(=509\)
145,5*5,09-33,5*5,09-12*5,09
=5,09*(145,5-33,5-12)
=5,09*100
=509
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\text{b.( 4,91+12,57)+( 5,09+7,43)}\)
\(=4,91+12,57+5,09+7,43\)
\(=\left(4,91+5,09\right)+\left(12,57+7,43\right)\)
\(=10+20\)
\(=30\)
học tốt
– 5,09 + 2,65 = - (5,09 – 2,65) = -2,44