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18 tháng 10 2015
18.42 + 36.79
= 18.42 + 18.2.79
= 18.42 + 18.158
= 18.( 42 + 158 )
= 18.200
= 3600
18 tháng 10 2015
18.42 + 36.79
= 18.42 + 18.2.79
= 18.42 + 18.158
= 18.( 42 + 158 )
= 18.200
= 3600
PD
3
20 tháng 7 2019
a) \(x-12.x+47-\frac{x}{20}=459\)
\(x.\left(1-12\right)+47-x.\frac{1}{20}=459\)
\(x.\left(-11\right)+47-x.\frac{1}{20}=459\)
\(x.\left(-11-\frac{1}{20}\right)+47=459\)
bạn ơi chắc đề bạn sai
NV
2
3 tháng 3 2018
a 60 - 26,75 - 13,25
= 60 - ( 26,75 + 13,25 )
= 60 - 40
= 20
b ) 45,78 + 38,42 - 25,78 - 18,42
= ( 45,78 - 25,78 ) + ( 38,42 - 18,42 )
= 20 + 20
= 40
PM
1
D
1 tháng 3 2016
12h27p+5h46p=17h63p ay 18h3p
6 ngày 15h+8 ngày 9h=14 ngày 24 h hay 15 ngày
8 p23 giây+8p 52 giây=16p 75 giâyhay 17p 15 giây
2h30p+12p=2h42p
BH
23 tháng 8 2019
a, 46*42+46*5+23*2*10+46*42+46=46*(42+5+10+42+1)=46*100=4600
b,5/3*1/9+5/3*5/9+5/3*7/9-5/3*4/9=5/3*(1/9+5/9+7/9-4/9)=5/3*1=5/3
XO
23 tháng 8 2019
a) 46 x 42 + 46 x 5 + 23 x 2 x 10 + 46 x 42 + 46
= 46 x 42 + 46 x 5 + 46 x 10 + 46 x 42 + 46
= 46 x (42 + 5 + 10 + 42 + 1)
= 46 x 100
= 4600
b) \(\frac{5}{3}\times\frac{1}{9}+\frac{5}{3}\times\frac{5}{9}+\frac{5}{3}\times\frac{7}{9}-\frac{5}{3}\times\frac{4}{9}\)
\(=\frac{5}{3}\times\left(\frac{1}{9}+\frac{5}{9}+\frac{7}{9}-\frac{4}{9}\right)\)
\(=\frac{5}{3}\times1\)
\(=\frac{5}{3}\)
CM
12 tháng 8 2018
Số lớn nhất trong các số 459 495; 459 549; 549 954 và 549 945 là 549 954.
Chọn C.
NT
10 tháng 1 2021
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