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\(\frac{168}{10}-x=18.65-\frac{1488}{100}\)
\(\frac{84}{5}-x=\frac{1865}{100}-\frac{1488}{100}\)
\(\frac{84}{5}-x=\frac{377}{100}\)
\(x=\frac{84}{5}-\frac{377}{100}\)
\(x=\frac{1680}{100}-\frac{377}{100}\)
\(x=\frac{1303}{100}\)
\(x=13.03\)
![](https://rs.olm.vn/images/avt/0.png?1311)
32:0,1=320. 32:10=3,2. 168:0,1=1680. 168:10=16,8. 934:0,01=93400. 934:100=9,34.
![](https://rs.olm.vn/images/avt/0.png?1311)
32:0,1=320
32:10=3,2
168:0,1=1680
168:10=16,8
934:0,01=93400
934:100=9,34
![](https://rs.olm.vn/images/avt/0.png?1311)
a, 2,5 x 18,65 x 4
= (2,5 x 4 ) x 18,65
= 10 x 18,65
=186,5
k mk nhé
a) 2,5 x 18,65 x 4
= (2,5 x 4) x18,65
= 10 x 18,65
= 186,50
b) 37,15 : 2,5 - 27,15 : 2,5
= (37,15 + 27,15) : 2,5
= 10 :2,5
= 4
đây nha bn
ht
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 1 : Bài giải
32 : 0,1 = 320
32 : 10 = 3,2
168 : 0,1 = 1680
168 : 10 = 16,8
934 : 0,01 = 93400
934 : 100 = 9,34
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{23}{5}\)\(=\)\(4\frac{3}{10}\);\(\frac{67}{10}\)\(=\)\(6\frac{7}{10}\);\(\frac{313}{100}\)\(=\)\(3\frac{13}{100}\); \(\frac{168}{11}\)= \(11\frac{68}{100}\)
mk nha
![](https://rs.olm.vn/images/avt/0.png?1311)
a. 168x168-168x68
= 168x(168-68)
= 168x100
= 16800
b. 201,5x17-2015x16-201,5
= 201,5x17-201,5x160-201,5
= 201,5x(17-16-1)
= 201,5x0
= 0
c. 1,5 + 1,5x2+1,5x7-10
= 1,5x1+1,5x2+1,5x7-10
= 1,5x(1+2+7)-10
= 1,5x10-10
= 10x(1,5-1)
= 10x0,5
= 5
d. 1,25x2,5x64
= 1,25x64x2,5
=80x2,5
= 200
a)168*168-168*68=168*(168-68)=168*100=16 800
b)201,5*17-2015*16-201,5=201,5*17-201,5*160-201,5=201,5*(17-160-1)=201,5*(-144)=-29016
c)1,5+1,5*2+1,5*7-10=1,5*(1+2+7)-10=1,5*10-10=(1,5-1)*10=0,5*10=5
d)1,25*2,5*64=1,25*2,5*8*8=(1,25*8)*(2,5*8)=10*20=200
![](https://rs.olm.vn/images/avt/0.png?1311)
168/10 = 16,8.
1488/100 = 14,88.
16,8 - X = 18,65 - 14,88
16,8 - X = 3,77
X = 16,8 - 3,77
X = 13,03.