-4.(-3.15).2,5-1,25.(-4,1).8+0,2
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a; (-2,5.0,38.0,4) - {0,125.3,15.(-8)}
= (-2.5.0,4).0,38 - {-8.0,125.3,15}
= - 1.0,38 - {-1.3,15}
= -0,38 + 3,15
= 2,77
b; {(-20,83).0,2 + (-9,17).0,2 : {2,47.0,5 - (-3,53.0,5}
= {0,2.(-20,83 - 9,17)}: {0,5.(2,47 + 3,53)}
= {- 0,2.30}:{0,5.6}
= - 6:6 : 0,5
= -1 : 0,5
= - 2
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{0,8\times0,4\times1,25\times2,5\times31,8+68,2}{0,1\times12,5\times4\times2,5\times2\times8\times0,2\times5}\)
\(=\frac{\left(0,8\times1,25\right)\times\left(0,4\times2,5\right)\times31,8+68,2}{0,1\times\left(12,5\times8\right)\times\left(4\times2,5\right)\times2\times\left(0,2\times5\right)}\)
\(=\frac{1\times1\times31,8+68,2}{0,1\times100\times10\times2\times1}\)
\(=\frac{31,8+68,2}{0,1\times100\times10\times2\times1}=\frac{100}{200}=\frac{1}{2}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a: \(=\left(1.25\right)^{16}\cdot8^{16}\cdot8=8\)
b: \(=\left(2.5\right)^9\cdot4^9\cdot4^6=4^6\cdot10^9\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 1 . Tính nhanh
a) 8,32 x 4 x 25
= 8,32 x ( 4 x 25 )
= 8,32 x 100
= 832
b) 2,5 x 5 x 0,2
= 2,5 x ( 5 x 0,2 )
= 2,5 x 1
= 2,5
c) 0,8 x 1,25 x 0,29
= ( 0,8 x 1,25 ) x 0,29
= 1 x 0,29
= 0,29
d) 9,2 x 6,8 - 9,2 x 5,8
= 9,2 x ( 6,8 - 5,8 )
= 9,2 x 1
= 9,2
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a: \(=\left(1.25\right)^{16}\cdot8^{16}\cdot8=8\cdot10^{16}\)
b: \(=\left(\dfrac{5}{2}\right)^{13}\cdot4^{13}\cdot4^2=10^{13}\cdot4^2\)
c: \(=\left(0.25\right)^4\cdot8^4\cdot8^2=2^4\cdot8^2=64\cdot16=1024\)
d: \(=\left(\dfrac{1}{2}\right)^{15}\cdot2^{18}=2^3=8\)
e: \(=\left(\dfrac{1}{3}\cdot6\right)^7\cdot\left(\dfrac{1}{2}\right)^7\cdot\dfrac{1}{2}=2^7\cdot\left(\dfrac{1}{2}\right)^7\cdot\dfrac{1}{2}=\dfrac{1}{2}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a: =5,3+5,1-5,3+4,9=10
b: =2,7-51,4-48,6+7,3
=10-100=-90
c: =2,5(-0,124+10,124)=2,5x10=25
d: =6,3-6,3+4.9=4,9
e: =15,3-21,5-4,5=-10,7
![](https://rs.olm.vn/images/avt/0.png?1311)
a,0.8*0.4*1.25*25+31.8+68.2*0.1*12.5*4*2.5*8*0.2*5=1100000
-4 . (-3 . 15) . 2,5 - 1,25 . (-4,1) . 8 + 0,2
= -4 . (-45) . 2,5 - (-5,125) . 8 + 0,2
= 180 . 2,5 - (-41) + 0,2
= 450 + 41 + 0,2
= 491,2
sai thì thôi nha!