200 . 0,25
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
Theo bai ta co
72,9:0,2x0,25x200:0,25
(Luot bo x0,25 va :0,25)
72,9:0,2x200
(Doi :0,2 thanh x5)
72,9x5x200
72,9x1000
72900
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 1,75 : 0,25 + 1,75 : 0,5 + 1,75 : 0,25
= 1, 75 : \(\dfrac{1}{4}\) + 1,75 : \(\dfrac{1}{2}\) + 1,75 : \(\dfrac{1}{4}\)
= 1,75 x 4 + 1,75 x 2 + 1,75 x 4
= 1,75 x (4 + 2 + 4)
= 1,75 x 10
= 17,5
b) 26,3 x 101 - 26 - 0,3
= 26,3 x 101 - (26 + 0,3)
= 26,3 x 101 - 26,3 x 1
= 26,3 x (101 - 1)
= 26,3 x 100
= 2630
c) (200 - 58) x 42 + (100 + 42) x 58
= 142 x 42 + 142 x 58
= 142 x (42 + 58)
= 142 x 100
= 14200
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{4,8x0,5+30,4x0,25}{200x0,05}=\frac{2,4+7,6}{50}=\frac{10}{50}=\frac{1}{5}\)
tk nếu đúng
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có: \(\left(\dfrac{3}{5}+0.415-\dfrac{3}{200}\right)\cdot2\dfrac{2}{3}\cdot0.25\)
\(=\left(\dfrac{120}{200}+\dfrac{83}{200}-\dfrac{3}{200}\right)\cdot\dfrac{8}{3}\cdot\dfrac{1}{4}\)
\(=\dfrac{8}{3}\cdot\dfrac{1}{4}=\dfrac{8}{12}=\dfrac{2}{3}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
<=>4a+0,5+5a+8a+a=200
<=>18a+0,5=200
<=>18a=199,5
<=>a=199,5:18=133/12
![](https://rs.olm.vn/images/avt/0.png?1311)
7: 0,25 - 3,2 : 0,4 + 8 \(\times\) 1,25
= 28 - 8 + 10
= 30
Đáp án: C
![](https://rs.olm.vn/images/avt/0.png?1311)
Tính:
a) \(8^3.\left(0,125\right)^3\)
\(=\left(8.0,125\right)^3\)
\(=1^3\)
\(=1.\)
b) \(7^{200}.\left(\frac{1}{7}\right)^{200}\)
\(=\left(7.\frac{1}{7}\right)^{200}\)
\(=1^{200}\)
\(=1.\)
c) \(\left(0,25\right)^3.64\)
\(=\left(0,25\right)^3.4^3\)
\(=\left(0,25.4\right)^3\)
\(=1^3\)
\(=1.\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\begin{array}{l}8.( - 0,125).( - 0,25).( - 400)\\ = ( - 1).100\\ = - 100\end{array}\)
Chọn C
![](https://rs.olm.vn/images/avt/0.png?1311)
\(=\left(\frac{120}{200}+\frac{83}{200}-\frac{3}{200}\right).\frac{8}{3}.\frac{1}{4}\)
\(=\frac{2}{3}\)
bằng 800