![](https://rs.olm.vn/images/avt/0.png?1311)
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)
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 1
a) 35,88 + 19,36 = 55,24
81,625 + 147,307 = 228,932
539,6 + 73,495 = 613,095
247,06 + 316,492 = 563.552
b) 8,32 + 14,6 + 5,24 = 28,16
8,9 + 9,3 + 4,7 + 5 = 27,9
324,8 + 66,7 + 208,4 = 599,9
24,9 + 57,36 +5,45 = 87,71
1a) 35,88 +19,36=55,24 b) 8,32 + 14,6 + 5,24= 28,16
81,625 + 147,307= 228,932 8,9 + 9,3 + 4,7 + 5= 27,9
539,6 +73,495= 613,095 324,8 + 66,7 + 208,4= 599,9
247,06 + 316,492= 563,552 24,9 + 57,36 + 5,45= 87,71
2,a) 25,7 + 9,48 +14,3= (25,7+14,3) + 9,48= 40+9,48= 49,48 b) 8,65 + 7,6 + 1,35 + 0,4= (8,65+ 1,35) + (7,6+0,4)= 10+8= 18
3,a) 26,45 ; 45,12 ; 12,43
tổng 3 số là; 26,45+ 45,12+ 12,43= 84
trung bình cộng 3 số là: 84:3= 28
b) 12,7 ; 19,99 ; 45,24 ; 38,07
tổng 4 số là: 12,7+ 19,99+ 45,24+ 38,07= 116
trung bình cộng 4 số là 116:4=29
![](https://rs.olm.vn/images/avt/0.png?1311)
a)8,32+14,6+5,24=22,92+5,24=28,16
b)24,9+57,36+5,45=82,26+5,45=87,71
c)8,9+9,3+7,7+5=18,2+9,7=27,9
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 1:
\(a.8,32+14,76+5,24=8,32+\left(14,76+5,24\right)\)
\(=8,32+20=28,32\)
\(b,16,88+9,76+3,12=\left(16,88+3,12\right)+9,76\)
\(=20+9,76=29,76\)
\(c,\left(\dfrac{2}{5}+\dfrac{7}{9}\right)+\dfrac{3}{5}=\left(\dfrac{2}{5}+\dfrac{3}{5}\right)+\dfrac{7}{9}\)
\(=1+\dfrac{7}{9}=\dfrac{16}{9}\)
\(d,\dfrac{19}{11}+\left(\dfrac{8}{13}+\dfrac{3}{11}\right)\)
\(=\left(\dfrac{19}{11}+\dfrac{3}{11}\right)+\dfrac{8}{13}=\dfrac{22}{11}+\dfrac{8}{13}\)
\(=2+\dfrac{8}{13}=\dfrac{34}{13}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Lời giải:
$5,24\times 0,43+2,62\times 0,62+0,39\times 5,24$
$=5,24\times 0,43+5,24\times 0,31+0,39\times 5,24$
$=5,24\times (0,43+0,31+0,39)=5,24\times 1,13=5,9212$
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
21,6 - X x 3 = 5,24 + 4,76
21,6 - X x 3 = 10
X x 3 = 21,6 - 10
X x 3 = 11,6
X = 11,6 : 3
X = 58/15
\(21,6-x\times3=5,24+4,76\)
\(21,6-x\times3=10\)
\(x\times3=21,6-10\)
\(x\times3=11,6\)
\(x=11,6:3\)
\(x=\dfrac{58}{15}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
(2014,43+5,57)+(1,68+8,32)+0,23+4,73
=2020+10+4.96
=2030+4.96
=2034,96
TL
Kết quả
= 28,16
Hok tốt
Mikko biết