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(x-12,5):3/4=8/5
(x-12,5) = 8/5 x 3/4
x-12,5= 1,2
x = 1,2+12,5
x = 13,7
hay x = 137/10
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(x-12,5\right):\frac{3}{4}=\frac{8}{5}\)
\(x-12,5=\frac{8}{5}.\frac{3}{4}\)
\(x-12,5=\frac{6}{5}\)
\(x=\frac{6}{5}+12,5\)
\(x=\frac{137}{10}\)
\(\left(x-\frac{2}{5}\right)\times\frac{5}{11}=\frac{75}{22}\)
\(x-\frac{2}{5}=\frac{75}{22}:\frac{5}{11}\)
\(x-\frac{2}{5}=\frac{15}{2}\)
\(x=\frac{15}{2}+\frac{2}{5}\)
\(x=\frac{79}{10}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Lời giải:
a.
$36,5\times 3+36,5\times 5+36,5\times 2=36,5\times (3+5+2)=36,5\times 10=365$
b. Dấu giữa $12,5$ và $0,4$ là gì vậy bạn?
![](https://rs.olm.vn/images/avt/0.png?1311)
a, 84,96 x 12,5 + 42,48 x 9,25 x 2 - 21,24 x 1,75 x 4
= 84,96 x 12,5 + 42,48 x 2 x 9,25 - 21,24 x 4 x 1,75
= 84,96 x 12,5 + 84,96 x 9,25 + 84,96 x 1,75
= 84,96 x ( 12,5 + 9,25 - 1,75 )
= 84,96 x 20
= 1699,2
b, 4,8 x 12,5 + 0,6 x 9,25 x 8 - 2,4 x 1,75 x 2
= 4,8 x 12,5 + 0,6 x 8 x 9,25 - 2,4 x 2 x 1,75
= 4,8 x 12,5 + 4,8 x 9,25 - 4,8 x 1,75
= 4,8 x ( 12,5 + 9,25 - 1,75)
= 4,8 x 20
= 96
Hok tốt !
![](https://rs.olm.vn/images/avt/0.png?1311)
Lời giải:
1. $=12,5\times 5+12,5\times 4+12,5$
$=12,5\times (5+4+1)=12,5\times 10=125$
2.
$=(0,4\times 0,25)\times (2\times 50)$
$=0,1\times 100=10$
![](https://rs.olm.vn/images/avt/0.png?1311)
ta có :
\(12.5:0.5+12.5:0.25+12.5:0.125-12.5\times4=12.5\times2+12.5\times4+12.5\times8-12.5\times4\)
\(=12.5\times\left(2+4+8-4\right)=12.5\times10=125\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(12,5:0,5+12,5:0,25+12,5:0,125-12,5\times4\)
\(=12,5\times2+12,5\times4+12,5\times8-12,5\times4\)
\(=12,5\times\left(2+4+8-4\right)\)
\(=12,5\times10\)
\(=125\)
_HT_
12,5x8+25x5:2-(100:4-12,5)x3
=100+125:2-25-12,5x3
=100+62,5-25-37,5
=100+37,5-37,5
=137,5-37,5
100
tính nhanh ạ